>> june 15th, 2010. albuquerque, new mexico. just past midnight, a 911 operator answers a caller who seems to be talking to someone else. >> how much gas are we going to put in, dave? i don't want to be in this truck anymore. >> she wasn't speaking to the operator. she was speaking to the third party. >> the operator suspects the woman is in danger and dispatches police. security footage at the flying-j truck stop shows officer aaron zwicky pulling in behind a parked car just as a man and woman are getting back into it. officer zwicky decides to act quickly before they leave. zwicky asks the man to step out of the vehicle. >> he asked me, what did i do wrong? i told him, i need to speak to you. >> they walked to the trunk where officer zwicky asks the man about a strange substance he noticed on the bumper. >> he stayed calm. he said he didn't know what the substance was.