07/12/2011 04:51 pm ET | Updated Sep 11, 2011

Charlie Sheen And Brooke Mueller Drug Addiction: No Drug Tests For Rehab Veterans

TMZ has learned ... Charlie Sheen and Brooke Mueller's custody settlement provides that neither is required to undergo drug testing ... something that is becoming increasingly troublesome.

As TMZ first reported ... Brooke was photographed last week holding what appeared to be a crack pipe. And there are other problematic images as well -- like the one recently in Hawaii, when Brooke walked up to a parked car in a seedy area with cash in hand.

Read more on tmz.com