How would the cops react if they see someone smoking MEDICAL marijuana?

They would confiscate marijuana from smokers and may arrest them, but what would they do if they see someone with medical marijuana? Medical marijuana=marijuana.

Some doctors prescribe medical marijuana to patients with a certain sickness to be cured.

: http://alcoholdrugstreatment.info/how-would-the-cops-react-if-they-see-someone-smoking-medical-marijuana