Apparently there is legislation proposed by Senator Orrin Hatch to ban SARMs. The legislation seeks to include SARMs as anabolic steroids and schedule them accordingly. The basis of the legislation is the assumption that SARMs have the "potential to increase the risk of heart attack or stroke and life-threatening reactions like liver damage." However - there is little to no research to support this assertion.
Interestingly, Hatch has both family and business interests in big pharma companies, and a number of those companies are in his electorate.
If you are into SARMs - might be a good time to stock up. Evolutionary.org has a good piece on this issue.