¶2The appellant was indicted for manslaughter, in violation of § 13A-6-3, Code of Alabama 1975. He was found guilty of vehicular homicide and was sentenced to five years in the State penitentiary. His sentence was split and he was ordered to serve 90 days in a "jail-like facility" and was then to be placed on formal probation. His probation was conditioned on staying out of trouble and completing a 13-month course at the Outreach Program. He was further ordered to pay $1000 under the Crime Victims Compensation Act and to pay the cost of the proceeding.
¶4The driver of the trash truck testified that from his experience in having observed cars and trucks in motion and having driven automobiles, he estimated the speed of the Toyota at approximately 70 miles per hour. Thereafter, a police officer who investigated the scene of the accident testified that he had investigated several hundred accidents. He stated that he had attended schools on the investigation of traffic accidents, including the Institute of Traffic of Northwestern University in Illinois, an advanced accident investigation course in Jacksonville, Florida, with the Institute of Police Technology and Management, and a course on accident reconstruction in Jacksonville, Florida with the Institute of Police Technology and Management. He testified that, during these courses, he was taught how to calculate the *538 speed of an automobile at the time of a collision and what factors or evidence on which to concentrate in determining speed. The officer testified to the specifics of his information gathering in the present accident, the measurements he made, and the photographs he observed. Generally, the formula which the officer used involved determining the weights of the two vehicles, determining the coefficient of friction of the road, and determining the distance which the truck was moved by the impact. The officer testified that this method has been accepted and used in the investigative community and that its reliability has been established. The officer concluded that the appellant's vehicle must have been traveling at approximately 56 to 61 miles per hour at the time of impact.
¶5The appellant argues that the officer should not have been allowed to give his opinion as to the speed of the vehicle, because, he argues a proper predicate was not laid for the admission of such testimony. The leading case concerning expert testimony as to the estimated speed of an automobile at impact is Maslankowski v. Beam, 288 Ala. 254, 259 So.2d 804 (1972). InMaslankowski, the Court determined that expert testimony was a proper means of determining such estimated speed, as "a jury would not be equally competent to reach a conclusion from the facts of the case." 288 Ala. at 264, 259 So.2d at 813. We find that here, as in Maslankowski, there were sufficient scientific data available upon which a reasonably accurate opinion as to the speed of the appellant's vehicle could be formulated. We base this conclusion on the officer's testimony concerning his measurements, the weights, the coefficients, and his analysis of the photographs. Furthermore, the officer testified that there were some skid marks, although he did not use them in his formula. We find that this officer was a properly qualified expert. His training had surpassed that of the general "investigating officer." The officer presented his qualifications and experience and also explained his methods in detail. Any objection to the inadequacy of facts or data would go to the weight of the evidence rather than its admissibility.Maslankowski v. Beam, 288 Ala. at 265, 259 So.2d at 814.
¶6The trial court did not abuse its discretion in allowing the officer to testify to his calculations concerning the speed of the appellant's automobile. As the Court stated inMaslankowski:
"This Court does not wish to be understood as holding that in all cases of automobile collision such evidence by any self-proclaimed expert is admissible, but as in every civil case where expert testimony is presented, the responsibility is on the trial court to satisfy itself of the requirements of the law regarding admissibility. If the responsibility is exercised with care so that reasonable expert testimony is presented based upon reasonably sound scientific approaches, then this Court will not reverse in the absence of an abuse of discretion."288 Ala. at 269, 259 So.2d at 818.
¶8The father's refusal to allow his son to take the test was properly admitted for the jury's consideration, as it was relevant toward the determination of whether the appellant was under the influence at the time of the accident. The test of relevancy in Alabama is liberal and "a fact is admissible if it has any probative value, however slight, upon a matter in the case." C. *539 Gamble, McElroy's Alabama Evidence, § 21.01(1) (3rd ed. 1977). Relevancy is distinguishable from weight or proof. 1A Wigmore,Evidence § 29 (Tiller's rev. 1983).
Id.¶9 "[J]udges constantly find it necessary to warn us that their function in determining relevancy is not that of final arbiters but merely of preliminary testers; the evidentiary fact offered does not need to have strong, full, superlative, and probative value and does not need to involve demonstration or to produce persuasion by its sole and intrinsic force but merely needs to be worth consideration by the jury. It is for the jury to give the fact the appropriate weight in effecting persuasion."
¶10The father's refusal was admissible because the State proved its relevancy. The refusal was in the nature of a tacit admission by the defendant. C. Gamble, McElroy's AlabamaEvidence § 193.01 (3rd ed. 1977). Contrary to the defendant's argument on appeal, there was evidence that the defendant was conscious when the tests were requested to and capable of responding to the request. Additionally, there was evidence that the father had observed and talked to his son before he refused to allow the tests to be performed.
¶11There is a logical relationship between the father's refusal to allow his son to take the test and the ultimate inference that his son was under the influence. Therefore, the testimony was relevant and properly placed before the jury for its determination of how much weight to accord the evidence. We find no abuse of discretion by the trial court in allowing the testimony into evidence.
¶14There was evidence that the trash vehicle's hazard lights were functioning on the day of the accident, and a police officer testified that they were visible from behind the trash vehicle. Any repair or alteration in the lighting of City trash trucks was irrelevant in the present case. The negligence of the owner or driver of the trash vehicle is not in issue. The appellant was convicted of homicide by vehicle, in violation of § 32-5A-191, Code of Alabama (1975), which states:
¶15 "Whoever shall unlawfully and unintentionally cause the death of another person while engaged in the violation of *540 any State law or municipal ordinance applying to the operation or use of a vehicle or to the regulation of traffic shall be guilty of homicide when such violation is the proximate cause of said death."
¶16Thus, the State must have shown the appellant unintentionally caused the death of someone else while violating a traffic or vehicular law or ordinance. In the present case, the State introduced evidence that the appellant was speeding and operating his vehicle in a reckless manner. There was also evidence that the appellant was driving under the influence. Both of the passengers in the appellant's car were killed as a result of the appellant's crashing into the back of the trash vehicle. The accident took place at approximately 1:00 p.m. Because any changes made to the lighting on City trash vehicles was irrelevant in the instant case, the trial court properly disallowed the evidence.
¶18The appellant cites Johnson v. State, 501 So.2d 568 (Ala.Cr.App. 1986), to argue that a police officer's testimony that a substance looks like marijuana is insufficient to prove that the substance was marijuana. However, in Johnson, the laboratory report on the marijuana was improperly allowed into evidence because "[t]here was a complete break in the chain of custody." Id. at 573. This court further stated in Johnson that the prosecutor had made a "final effort" to introduce the evidence by attempting to establish an officer as an expert in recognizing marijuana. However, this effort proved futile because the officer testified that he never saw the substance before it got to the crime lab. Id. at 574. Therefore, because the substance taken from the scene was not sufficiently established as the marijuana which was examined at the crime lab, the State's case failed. However, in the present case, the testifying officer was present at the scene of the accident and made his observations concerning the marijuana at that time. Therefore, this conviction is due to be affirmed.
¶19AFFIRMED.
¶20All Judges concur except PATTERSON, J., who dissents without opinion.