Yeah, Why Didn't They?

Little Johnny's kindergarten class was on a field trip to their
local police station where they saw pictures tacked to a bulletin board
of the 10 most wanted criminals. One of the youngsters pointed
to a picture and asked if it really was the photo of a wanted
person.

"Yes," said the policeman. "The detectives want very badly to capture him."

Little Johnny asked, "Why didn't you keep him when you took
his picture?"