Dear Chris,
I dont know for sure. There are many labs that can do all kinds of testing-check with your state (or washington state) agricultural department for a listing of testing labs,,,
I think that if you test one can of chew it may or may not be, but maybe tobacco is bought on the spot market and blended--probably will change with every log you buy.
Spit or swallow? might be safer not to spit chew, but swallowing is probably not good for your health. good idea would be to spit in a container.
Sorry I did not answer your question fully, but I have seen this question for awhile now