You would assume so because of all the money to be made in meth trafficking but other than the Philly family and Northeast mob as you mentioned I never heard of any traditional family doing so. I'm thinking that, until recently, meth was mostly a rural white and Mexican drug and those groups already had their distribution networks with bikers and the Mexican Mafia. Now, since Meth is in the burbs and city I would think you'd see the mob moving in where it fits.