>> hi, justin. >> hello. >> hi, it's detective jodi gonterman with the apd. how are you?and outright refused to give a dna sample. >> i felt like the way you guys were coming at me was like no matter what i said. i was the person you were looking for and no one wants to be that. >> hansen ended the call demanding an apology. >> i'd appreciate a call to hear an apology >> i'll apologize after i get your direct dna. >> detective gonterman had been investigating justin hansen for 5 months now. yet, there was still a question mark next to his name. so, time again, for gonterman to get creative. >> coming up -- an undercover mission to mcdonalds? >> they followed him, and watched him eat. >> a hunt for treasure in the trash. >> i said, "i can't believe this. " >> when "dateline" continues. knocks out symptoms from over 200 allergens. without knocking you out. feel the clarity and make today the most wonderful time of the year. live claritin clear. after advil. feeling better? on top of the worlddddd!!! before advil. advil targets pain at the source of inflammation. when pain c