Drugs, Prescription - As enacted, authorizes a law enforcement officer to cause to be administered a blood or urine test on a person for the presence of a psychotropic drug if such officer has probable cause to believe that the person committed a mass shooting and the person consents to such test; clarifies that if the person is a minor, then a parent or legal guardian must consent; directs the health science center to study the drug interactions between any drugs found in the person's blood or urine. - Amends TCA Title 38; Title 40; Title 53; Title 63 and Title 68.