Karr was driven to the Convent of the Sacred Heart school in a limousine with two ABC "Good Morning America" producers and Karr "stepped out of the limo and stood (outside the school) for two or three minutes, walked down the sidewalk, went up to the door and looked in the window," Sgt. Steve Mannina told the San Francisco Chronicle.
Neither Karr nor the ABC producers were arrested because they did not break any laws, Mannina said.
A school official who saw the 41-year-old former teacher wandering outside the building called police.
ABC did not say why the producers drove Karr to the school, but he has reportedly hired an entertainment attorney to help him stay in the spotlight.
Karr fled the United States following his arrest on child pornography charges in 2001. He turned up in Thailand about two months ago and claimed responsibility for JonBenet's 1996 slaying.
His claim was proven to be bogus and the 5-year-old child pornography charges were dismissed Thursday by a Sonoma County, Calif., judge.