I received 5 "estate" pipes from the 'Bay today and they all had some thick "residue" at the top of the bowl, but the bottom seemed relatively clean. It was suggested by my MIL that a less than legal substance may have caused the issue and I just wanted to ask if there might be some other explanation for it. Seems a shame that some idiot would smoke dope out of a nice briar pipe, but stranger things have happened, I'm sure. Any input is appreciated.