You'll have to find the state law and read it yourself... There might be some loophole that you can exploit. However, the law more than likely simply states something to the affect that if you are using a cellular device with the car running then you can be ticketed. As for the pill thing, as Jeff above said, it depends on the time release mechanism. By cutting it in half you will end up with either half the dose being released over 12 hours or half the dose immediately digested and absorbed into your system. As for the BMW, your best bet is to search google for "service bulletins" and the like for your particular car. The main thing is it is a BMW and BMW parts cost more than parts for a Ford, Nissan, Chevy, Honda, etc. So chances are when you do brakes or anything else on the car it will cost more than most other brands.