With the recent California state legalization, I've been thinking about alternative payment options and really believe cyrpto currency payments are the future. This would be a huge step forward to address the serious security issues with this 'cash only businesses' in the states.
Implementation success would need to include other coins, not just bitcoins per the high investment costs.

Customers, growers, distributors, shops, dispensaries could all use crypto currency payments, perhaps rewarded with a 'discount/reduced cost' for goods/services as an incentive to use crypto currency payments.

Possible roadblock?
Assuming some vendors/bills will only accept cash payments (until crypto currency payments are widely adopted), how would these folks cash out coins to fiat from the exchanges as they are not allowed to use traditional (federally insured) bank accounts in this industry?

The future is green!