In an Open Letter to all Federal Firearms Licensees issued by the U.S. Department of Justice Bureau of Alcohol, Tobacco, Firearms and Explosives on September 21, 2011, they pointed out that while a number of states have passed legislation allowing under State law the use or possession of marijuana that Federal law prohibits it.
What does this mean?
According to the ATF it means any person who uses or is addicted to marijuana, regardless of whether his or her State has passed legislation authorizing marijuana for medical purposes, is prohibited by Federal law from possessing firearms or ammunition.
So, if you are a card carrying Medical Marijuana user, you must answer “YES” on the ATF Form 4473 and you may not buy a gun or ammunition from ANY GUN STORE in the USA.
Furthermore, if the employees of Detroit Arms are aware that the our potential customer is in possession of a card authorizing the possession and use of marijuana under State law, then we are then required to have “reasonable cause to believe” that this customer is an unlawful user of a controlled substance and, as such, we are prohibited from transferring or selling firearms and/or ammunition to you, even if you have answered “No” to question 11.e on ATF Form 4473.
If you have questions with regard to this, please contact the ATF’s Firearms Industry Programs Branch at 202-648-7190.

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i just would like a simple yes or no answer can i be a caregiver and have a cpl and carry a pistol in michigan or does the state prohibit me from having a cpl i seen the section on buying and selling guns but didnt read anything on cpl .
Well, if you are a USER then No. If you are NOT a user, then Yes.