>> that's where it turned to hell. i could see them on the outside camera. i could see them uk with aing down the street. i thought they were just clearing trucks off the people because there were a lot of drunken people in the street that night. but then they stopped at the buzzer. i just kind of leaned to the intercom and i said yes. they said boston police, we got a report of a disturbance on the premises. so i buzzed them in. >> reporter: that decision to buzz them in is something rick abath has had to live with for the past 25 years. >> the night watchmen, against protocol, allowed them in to the museum. >> reporter: anthony amore is an active investigator on this case. he says back in 1990, no one was allowed in to the museum after hours. not even police officers. but rick, the security guard, says he routinely would buzz in