GRAND JUNCTION, Colo. (KKCO) - In order to carry a concealed weapon, the federal law says you can't use any illegal drugs.

"The question on the permit is pretty common sense. It has to do with whether the applicant is using stimulants, depressants, or any illegal narcotic, drug or marijuana that's illegal essentially," says Heather Benjamin, spokesperson for the Mesa County Sheriff's Office.

However, medical marijuana is legal in Colorado. Medical marijuana patient Mike Marshall says he uses marijuana to help relieve pain from a stroke before he goes to sleep. Mike has experience with guns, but wasn't aware of the conceal carry laws. He paid for a four hour safety class to get his permit. "I used to be an avid hunter and shooter. I enjoy firearms. It's part of what i do as a hobby," says Marshall.

However, he was denied, and now questions why some are allowed to carry and still drink under the limit or use prescription drugs. "There is no distinction between marijuana and alcohol. Why is one different than the other?" says Marshall.

Some medical marijuana patients argue they should be able to carry if they're not under the effects of marijuana. However, the federal law is clearly laid out. "Just because a state law says something is legal, if a federal law says it's illegal, the federal law supersedes state law in every situation," says Benjamin.

It's another situation where medical marijuana users say they're unfairly treated. "It seems like a double standard, and it's basically discrimination in my opinion," says Marshall. He was, however, reimbursed for his class.

The Mesa County Sheriff's Office posts several warnings on its website that concealed carry permits won't be given to anyone who uses marijuana.