This subchapter does not limit:
(1) The admissibility of any evidence: In connection with the investigation or prosecution of a crime with regard to a person who does not meet the requirements of § 20-13-1704; or
(2) With regard to other crimes committed by a person who meets the requirements of § 20-13-1704;
(3) Any seizure of evidence or contraband otherwise permitted by law; or
(4) The authority of a law enforcement officer to detain or take into custody a person in the course of an investigation or to effectuate an arrest for any offense except as provided in § 20-13-1704.