"These two kids, they didn't drink, they didn't smoke, they didn't do drugs," Ken Reimer tells PEOPLEFrom left: Mary Mich and Luke ReimerCredit: Courtesy of Ken ReimerNEED TO KNOWKen Reimer, 62, is speaking out after his 20-year-old son Luke was found dead inside a car with his girlfriend on their college campus in JanuarySteubenville Police previously said the young couple died of carbon monoxide poisoning"My number one goal right now is that t…