Penn State assistant football coach Mike McQueary says he witnessed former assistant coach Jerry Sandusky molesting a boy but that he didn't call police because he was sure "the act was over."

McQueary took the stand Friday in a Pennsylvania courtroom against two school officials accused of lying to a grand jury about the child sex-abuse allegations against Sandusky.

Under cross-examination, McQueary answered a question that many observers had asked: Why didn't he call police on Sandusky?

He says it was because it was "delicate in nature" and that he tried to use his best judgment. He says he was "sure the act was over."

He says he later informally raised questions to people he worked with about why Sandusky was still allowed around the football program.

(Copyright 2011 by The Associated Press.  All Rights Reserved.)

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