Detective Anthony Sassano testified Thursday afternoon in the sex abuse trial of the former PSU assistant football coach.
According to PennLive.com, Sassano discussed physical evidence in the case, including photographs of some of the alleged victims seized from the Sandusky home, and the layouts of Sandusky's home and the PSU locker rooms where many of the alleged assaults are said to have taken place.
Sassano testified that the investigation into Sandusky began in December 2008 and that the AG's office was referred through an anonymous email to witness Mike McQueary, who testified Tuesday about seeing Sandusky allegedly sexually assaulting a young boy in the PSU locker room shower.
Sassano also testified that getting the alleged victims to come forward was difficult.
"To get them to admit to performing sex acts on a man was a daunting task," said Sassano.
Earlier Thursday, two more alleged victims of sex abuse by Sandusky testified, one of whom said the former Penn State assistant football coach called himself the "tickle monster" before embracing him in a shower.
The man prosecutors have called "Victim 6" told the jury that the first time Sandusky took him to the PSU gym to work out they only spent 15-20 minutes exercising before the former coach said it was time to shower.
"My immediate thought is I am not even sweating yet," said the now 25-year-old man. "I didn't want to be awkward to him about it. So I said ok and we left the gym area."
But the witness testified that he felt uncomfortable at the prospect of showering with the older man.
"No one besides my parents have seen me like that, without my clothes on," said the witness.
He testified that Sandusky started to tickle him, referring to himself as the "tickle monster" and picked him up in a bear hug: "I remember seeing his chest hair next to my face I remember thinking "this is icky.'"
Judge John Cleland said prosecutors might finish presenting their case Thursday.
The ex-coach faces 52 criminal counts involving alleged assaults of 10 boys over a 15-year span. He denies the charges, which brought disgrace to Penn State and led to the ouster of both the school's president and Hall of Fame football coach Joe Paterno.
Sandusky's attorney questioned Victim 6 and the man the prosecutors have identified as "Victim 3" who also testified Thursday about connections they had with other alleged victims. The defense has claimed that the accusers have financial motives, but they've all denied that.
Additional reporting by CBS News' Paula Reid in Bellefonte, Pa.