duke: it was a pickup slip for a roll of film that was being developed at the nisson pharmacy. and that was the pharmacy where rob piest disappeared from. sullivan: a day or so after the first search warrant, i asked the police department if they would put a 24-hour surveillance on gacy with the hopes that, in fact, he would go back to wherever rob was now. two 12-hour shifts, two guys they watched him around the clock. hachmeister: my partner and i really, we had no exact direction where to go with this case, other than the fact that we were not to lose him. albrecht: i decided pretty much that the first night that we were out, that if gacy went into a public place, dave and i would go in and follow him. hachmeister: we didn t want to leave him alone for one minute.