¶1Gerald Cornelius Eldridge seeks a certificate of appealability (COA) on the issue *125of his competence to be executed under Ford v. Wainwright
¶2I
¶3In 1994, Eldridge was convicted of murdering his former girlfriend Cynthia Boga-ny, and her daughter Chirissa, and was sentenced to death.
The evidence established that Eldridge went to Cynthia Bogany’s apartment, kicked in the door, and shot Chirissa between the eyes at point-blank range, killing her instantly. Eldridge then shot at close range his son Terrell and anoth- • er individual, Wayne Dotson, both of whom were wounded but survived. Cynthia fled the apartment but Eldridge chased and caught her when she tripped and fell on the stairs outside a neighbor’s apartment. Despite Cynthia’s pleas for her life, Eldridge shot her twice in the head, killing her instantly. Eldridge was twenty-eight years old at the time of the murders.4
¶4Eldridge’s first habeas corpus petition was pending in the Texas state courts when the Supreme Court decided Atkins v. Virginia.
¶5On August 19, 2009, Eldridge moved the state trial court to appoint a mental-health expert to conduct a preliminary evaluation of his competence to be executed.
¶6The district court determined Eldridge had made a substantial showing of incompetency based on demonstrated bizarre behavior and delusional statements, corroborated by expert evidence, and that El-dridge was entitled to a fair hearing on his claim.
¶7At the hearing, the district court heard from four mental health experts: Dr. Pra-dan A. Nathan, Eldridge’s treating physician for two years prior to the hearing; Dr. Michael Roman, a clinical psychologist retained by Eldridge specifically for his habeas petition; Dr. Thomas Allen, a psychiatrist retained by the State; and Dr. Moeller, the forensic psychologist who testified in the state habeas proceedings, also retained by the State.
¶8In determining that Eldridge was competent, the district court first noted that a number of mental health professionals had raised questions about El-dridge’s credibility and found that he was feigning symptoms, and that other courts had rejected his claims of mental retardation based on findings that his claimed cognitive and intellectual limits were not credible or accurate.
[The State] was able to marshal far more evidence in support of [its] position that Eldridge has a far greater understanding of the reality he faces than Eldridge admits or describes ... including] years of inconsistencies in the symptoms Eldridge described and the behavior he exhibited; years of mental health professional assessments; test results showing malingering; and Dr. Allen’s own observations of the numerous and substantial inconsistencies between Eldridge’s claimed symptoms and his behavior.25
¶9*127The court noted that Dr. Moeller had also “presented compelling evidence that El-dridge is malingering, noting the atypical presentation of Eldridge’s symptoms.”
¶10The district court considered sua sponte whether Eldridge was entitled to a COA.
¶11II
¶12To obtain a COA under 28 U.S.C. § 2253(c), a petitioner “must make ‘a substantial showing of the denial of a constitutional right’ by demonstrating that ‘reasonable jurists would find the district court’s assessment of the constitutional claims de- • batable or wrong.’ ”
¶13“In a habeas corpus appeal, we review the district court’s findings of fact for clear error and review its conclusions of law de novo; applying the same standard of review to the state court’s decision as the district court.”
¶14In sum, a COA should issue for Eldridge if reasonable jurists could debate whether the district court did not clearly err when it found Eldridge competent to be executed.
¶15Ill
¶16The Eighth Amendment’s prohibition on cruel and unusual punishment prohibits the execution of a prisoner who is incompetent.
¶17In concluding that Eldridge had a rational understanding of those facts and was therefore competent to be executed, the district court found that although El-dridge had presented evidence of mental illness, there was extensive evidence inconsistent with his claim of incompetence, particularly in regard to malingering and feigning symptoms.
¶18A
¶19Eldridge first argues that the district court failed to give sufficient weight to the evidence that his symptoms had been documented at length by mental health professionals at the Texas Department of Criminal Justice (TDCJ) without any suggestion that they might be feigned, and that he has been prescribed powerful antipsychotic medications since 2009.
¶20Eldridge takes issue with the district court’s reliance on his past history of ma*129lingering, which he claims constitutes an improper assumption that he is necessarily-feigning his present symptoms. However, the district court’s reliance on Eldridge’s past history of malingering was only one of a number of facts that it appropriately considered as probative, but not disposi-tive, evidence of malingering.
¶21B
¶22The district court' found that Dr. Nathan’s conclusion that Eldridge’s symptoms were genuine did not support a finding that he was incompetent to be executed because Dr. Nathan had conducted his evaluations of Eldridge via videoconference and had not specifically tested for malingering.
¶23As Dr. Nathan testified, however, he saw Eldridge in a clinical, rather than forensic, capacity.
¶24C
¶25Eldridge next challenges the district court’s determination that Dr. Roman was “neither reliable nor credible.”
¶26But even assuming, arguendo, that El-dridge is correct on both points, it does not follow that the district court’s determination that Dr. Roman’s testimony was neither reliable nor credible was in error. The district court’s adverse credibility determination of Dr. Roman was premised in large part on Dr. Roman’s inadequate responses to the “numerous red flags indicating malingering throughout Eldridge’s record.”
¶27Eldridge argues that Dr. Roman acknowledged the contrary evidence and did not ignore it. However, this does not address the district court’s concern that Dr. Roman responded to this evidence by deemphasizing it or providing unsatisfactory explanations as to why it did not indicate malingering. Additionally, the district court noted that Dr. Roman had conducted only one previous capital competency evaluation and had been found to be not credible by the district court in that case.
¶28D
¶29Eldridge next argues that the district court relied on scientifically flawed assertions by Dr. Allen and Dr. Moeller when finding Eldridge competent to be executed. However, there is nothing in the record to which Eldridge can point that could render infirm the district court’s findings.
¶30Eldridge first argues that Dr. Moeller’s testimony that schizophrenia is a progressive, degenerative disease is inaccurate, as was his conclusion that the absence of increasingly severe symptoms is indicative of malingering.
¶31*131Next, Eldridge contends the district court accepted Dr. Allen’s erroneous assertion that genuine symptoms of psychosis are not self-serving.
¶32Eldridge asserts the district court erred by accepting Dr. Allen’s and Dr. Moeller’s testimonies that Eldridge’s claimed delusions were not credible because he did not exhibit behaviors consistent with his delusions, and by discrediting Dr. Roman’s double-bookkeeping theory of schizophrenia, which would have provided an explanation for the inconsistencies.
¶33The purported scientific errors alleged by Eldridge are thus not sufficient such that reasonable jurists could debate that the district court did not clearly err when weighing the scientific conclusions of the expert witnesses.
¶34E
¶35Lastly, Eldridge asserts that the district court erred in finding that Eldridge is malingering and competent to be executed. For one, Eldridge argues that the district court should not have found inconsistencies in his delusions and behaviors and points to a few examples of consistencies.
¶36The district court’s discussion of the expert witnesses’ testimony supports its finding that Eldridge is malingering. For example: Dr. Moeller testified that the fluctuations in Eldridge’s symptoms were too severe to be natural waxing and waning, as Dr. Roman asserted. Waxing and waning of symptoms occurs gradually but Dr. Moeller’s review of Eldridge’s psychiatric history reveals rapid changes from symptomatic to non-symptomatic.
¶37Dr. Allen noted several oddities in the historical presentation of Eldridge’s symptoms. As an example, Eldridge reported a combination of auditory, tactile and visual hallucinations; this combination, Dr. Allen testified, is inconsistent with genuine mental illness.
¶38The district court was further persuaded by Dr. Roman’s concessions regarding much of the evidence of malingering in Eldridge’s psychiatric history. First, Dr. Roman stated that certain delusions El-dridge self-reported were “crazy stuff’ inconsistent “with the way that mentally ill people present.”
¶39Ultimately Dr. Moeller and Dr. Allen believed that Eldridge was malingering. Although Dr. Nathan and Dr. Roman both concluded that Eldridge was not competent to be executed, Dr. Nathan did not test Eldridge for malingering
¶40We therefore DENY Eldridge’s application for a COA on the issue of his competence to be executed.
¶41 Pursuant to 5th Cir. R. 47.5, the court has determined that this opinion should not be published and is not precedent except under *125the limited circumstances set forth in 5th Cir. R. 47.5.4.
¶42. 477 U.S. 399, 106 S.Ct. 2595, 91 L.Ed.2d 335 (1986).
¶43. 551 U.S. 930, 127 S.Ct. 2842, 168 L.Ed.2d 662 (2007).
¶44. R. at 1965.
¶45. Eldridge v. Quarterman, 325 Fed.Appx. 322, 323 (5th Cir.2009).
¶46. 536 U.S. 304, 122 S.Ct. 2242, 153 L.Ed.2d 335 (2002).
¶47.R. at 1965.
¶48. R. at 1965-66.
¶49. R. at 662-64.
¶50. Eldridge, 325 Fed.Appx. at 329.
¶51. R. at 1966.
¶52. R. at 1966.
¶53. R. at 1966.
¶54. R. at 1967.
¶55. R. at 1967.
¶56. R. at 1967.
¶57. R. at 1967.
¶58. R. at 955.
¶59. 551 U.S. 930, 127 S.Ct. 2842, 168 L.Ed.2d 662 (2007).
¶60. R. at 956; see 28 U.S.C. § 2254(d).
¶61. R. at 958, 964.
¶62. R. at 1968-69, 1972, 1982, 1984, 2835, 2954.
¶63. R. at 1992-93.
¶64. R. at 1993-94.
¶65. R. at 1992.
¶66. R. at 1994.
¶67. R. at 1994.
¶68. R. at 1999.
¶69. R. at 1999.
¶70. Hearn v. Thaler, 669 F.3d 265, 271 (5th Cir.2012) (quoting Slack v. McDaniel, 529 U.S. 473, 484, 120 S.Ct. 1595, 146 L.Ed.2d 542 (2000)).
¶71. Miller-El v. Cockrell, 537 U.S. 322, 336, 123 S.Ct. 1029, 154 L.Ed.2d 931 (2003).
¶72. Blue v. Thaler, 665 F.3d 647, 653 (5th Cir.2011) (citation and internal quotation marks omitted).
¶73. Thompson v. Cain, 161 F.3d 802, 805 (5th Cir. 1998).
¶74. Patterson v. Dretke, 370 F.3d 480, 484 (5th Cir.2004).
¶75. R. at 956; see Panetti v. Quarterman, 551 U.S. 930, 949, 127 S.Ct. 2842, 168 L.Ed.2d 662 (2007) (“Once a prisoner seeking a stay of execution has made 'a substantial threshold showing of insanity,’ the protection afforded by procedural due process includes a ‘fair hearing’ in accord with fundamental fairness.” (quoting Ford v. Wainwright, 477 U.S. 399, 424, 426, 106 S.Ct. 2595, 91 L.Ed.2d 335 (1986) (Powell, J., concurring))).
¶76. R. at 956 ("[T]he state court findings are not entitled to deference under AEDPA."); R. at 1963-2000 (evaluating Eldridge's competency with no deference to state court determinations); see Panetti, 551 U.S. at 948, 127 S.Ct. 2842 (holding that no deference was owed when the "state court's failure to provide the procedures mandated by Fordconstituted an unreasonable application of clearly established law").
¶77. Thompson, 161 F.3d at 805; see also Panetti v. Stephens, 727 F.3d 398, 409-10 (5th Cir.2013) (reviewing the district court’s competence standard de novo while reviewing the *128district court’s "ultimate finding of competency” for clear error).
¶78. St. Aubin v. Quarterman, 470 F.3d 1096, 1101 (5th Cir.2006).
¶79. Ford v. Wainwright, 477 U.S. 399, 409-10, 106 S.Ct. 2595, 91 L.Ed.2d 335 (1986).
¶80. See Panetti, 551 U.S. at 960-61, 127 S.Ct. 2842 ("[W]e do not attempt to set down a rule governing all competency determinations.”).
¶81. Panetti, 727 F.3d at 409-10.
¶82. R. at 1991-92.
¶83. R. at 1992.
¶84. Eldridge Br. at 31-32.
¶85. R. at 1992.
¶86. R. at 1998.
¶87. R. at 1998.
¶88. R. at 1992.
¶89. Eldridge Br. at 34-35.
¶90. Eldridge Br. at 36-39.
¶91. R. at 2836.
¶92.R. at 2836, 2947-48.
¶93. R. at 1972, 2899-902, 2951.
¶94. R. at 1993.
¶95.Eldridge Br. at 41-43.
¶96. Eldridge Br. at 43-45.
¶97. R. at 1993.
¶98. R. at 1993.
¶99. R. at 1993; see also Wood v. Thaler, 787 F.Supp.2d 458, 499 (W.D.Tex.2011) (“This Court finds incredible the conclusions and diagnosis of Dr. Michael A. Roman_ Dr. Roman's diagnosis is simply unworthy of belief.”).
¶100. Eldridge Br. at 45-46.
¶101. R. at 1994.
¶102. R. at 1983, 1994.
¶103. Eldridge Br. at 47.
¶104. R. at 3642-47.
¶105. R. at 3646-47.
¶106. See R. at 1997 (finding that another capital inmate's claim of incompetency was significantly more compelling, in part because he "had a long documented history of mental illness that predated his crime; Eldridge does not”).
¶107. Eldridge Br. at 46-47.
¶108.R. at 1989-1990.
¶109. R. at 1991-95.
¶110. R. at 1993-94; Eldridge Br. 49-51.
¶111. R. at 2998-99.
¶112. R. at 3672; Eldridge Br. at 51.
¶113. R. at 3483, 3494-95, 3512-13.
¶114. R. at 3483.
¶115. R. at 3712-13.
¶116. Eldridge Br. at 52.
¶117. R. at 1983, 3490-91.
¶118. R. at 1983, 3484.
¶119. R. at 1986, 3550 ("[Dr. Allen]: It would be really rare to have someone who is delusional and has inconsistent hallucinations and tactile hallucinations and the hallucinations include auditory and visual hallucinations. That just would be incredibly rare.”).
¶120. R. at 1987, 3570-72.
¶121. R. at 3203.
¶122. R. at 1979-80, 3257-58.
¶123. R. at 1980, 3258-60.
¶124. R. at 1981, 3331-32.
¶125. R. at 1971-72.