[Patrick C]

Although I studied biochemistry I cannot say at this point if washing with soap and water would remove barium and antimony which the NAA picks up. Oswald had plenty of opportunity to wash his hands and face......anyway

A quick search on Google ......"you can wash your hands with soapy water and most of it will come off, .."

This seems to escape people's notice...Oswald could have washed his face....

What was the time between him leaving the Tippit scene and Brewer seeing him.....20 minutes at least......?

Maybe he used a washroom somewhere on the Bld......and no one saw him.....