Oregon social service officials are allowing certain food stamp applicants to deduct medical marijuana costs from their income when qualifying for benefits.  According to the Oregonian; only elderly or permanently disabled Oregonians who qualify for Social Security Disability insurance may file for the deduction.  The deduction puts the state at odds with the federal government.  Our neighboring states, California and Washington defer to federal guidelines, which say the deduction is not allowed.  A spokesman for the Oregon Department of Revenue says the deduction is so limited, it’s rarely used.