Generally revise medical marijuana purchase limits

This bill amends Montana's medical marijuana laws to increase the amount of usable marijuana that registered cardholders can possess and purchase. It raises the monthly purchase limit from 1 ounce to 5 ounces and the daily purchase limit from 1 ounce to 5 ounces, while also increasing the possession limit from 1 ounce to 5 ounces. The legislation allows cardholders to request exceptions to the monthly limit with a physician's confirmation that their medical condition requires more marijuana. These changes directly affect registered medical marijuana patients and dispensaries that sell to them, establishing new purchase and possession thresholds within the state's legal framework.