Defense lawyer Joe Amendola had sharp questions for two state police investigators who interviewed the alleged victims.
After playing 16 minutes of a four-hour interview from April 2011 with the young man known as "Victim 4," Amendola questioned the investigators heard on the tape about what details they shared during those interviews.
Amendola asked retired Cpl. Joseph Leiter if investigators told interviewees about others who had stepped forward.
"In some of our interviews ... we did tell them," he said.
Asked why, Leiter said it was to let possible victims know they were not alone.
"Each of these accusers was very, very seriously injured, and very concerned, and we had told them - especially prior to going to the grand jury - that they wouldn't be alone, that there were others," Leiter said.
Leiter said that did not include sharing individual accusers' recollections of abuse, such as specific sex acts.
"We never told them what anyone else had ever told us," he said.
But Amendola later read Leiter portions of an interview transcript in which the investigator told the accuser that others had reported abuse that progressed to oral sex and rape.
"Victim 4," now 28, testified last week that Sandusky sexually abused him in the locker-room showers and in hotels for five years while trying to ensure his silence with gifts and trips to bowl games.
On the stand, he admitted that he lied to police and his own lawyer about the alleged abuse, saying he had "denied it forever." But he testified calmly and firmly, saying Sandusky performed oral sex on him and sent him "creepy love letters."
The man's attorney, Ben Andreozzi, was called to the stand and asked about a discussion he had with investigators during a break in an interview with his client.
On a difficult-to-hear recording of the discussion, Andreozzi and Leiter can be heard talking about the investigation while the accuser is out of the room.
Andreozzi acknowledged to jurors that a guilty verdict in Sandusky's trial could have an impact on his client if he files a civil lawsuit but he told the court that hadn't been decided yet.
Andreozzi also denied coaching his client on what to say to investigators.
"He viewed Jerry as a father figure to him. It's been extremely difficult talking about this publicly," Andreozzi said.
The defense appeared to catch one of the investigators in a lie after recalling him to the stand. Trooper Scott Rossman said that he hadn't spoken to Leiter about their testimony after he first left the stand Tuesday but Leiter said they had talked about it.
Sandusky is charged with 51 criminal counts related to 10 alleged victims over a 15-year span. He's accused of engaging in illegal sexual contact ranging from fondling to forced oral and anal sex.
Prosecutors rested their case Monday after presenting 21 witnesses, including eight who said they had been assaulted by Sandusky.
Remaining possible defense witnesses include Sandusky's wife, Dottie, and an expert who could discuss whether Sandusky has "histrionic personality disorder," which experts have called a personality disorder characterized by inappropriate sexual behavior and erratic emotions.
Additional reporting by CBS News' Paula Reid in Bellefonte, Pa.
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