I dunno. 7 years you've been riding the roller coaster...arrests, billy clubs, death threats, copious amounts of drugs stashed in your home, numerous rehab attempts. Way too much drama.
Knowing this drug as I do, I can't in good conscious encourage continuing to live like that. Though some of these new designer drugs scare me, meth and crack are the two that should strike fear in even the bravest of souls. Even the police have special protocols when dealing with tweakers...and for good reason. The sudden onset of violence is completely unpredictable.
I'm not saying divorce right now. But, I would suggest legal separation to protect your home and finances at this point. If she continues to drive loaded, you could lose everything if something bad were to happen.
Are you doing anything for you? What type of support system and safety nets do you have in place?