I think I've got it.

This is from "The Dad Who Came in From the Cold." Clark and Lois have been invited to dinner by Jimmy's dad (along with Jimmy, of course). The conversation leads Clark to become suspicious of Jack, who's employed by NIA, so he x-rays Jack's clothing to find all sorts of weapons.

-- Roger

"The Constitution only gives people the right to pursue happiness. You have to catch it yourself." -- Benjamin Franklin