All military members must submit to random drug testing. When I was in the Air Force I had a security clearance, and the drug testing was even more frequent. Should the president and white house staff also be required to undergo drug testing?
obama, bush and clinton have all had histories of illegal drug use. clinton laughingly said he did not inhale. bush refused to discuss the rumors of cocaine use, but also had a true spiritual conversion and quit drinking and presumably drugs as well. obama wrote openly of his use of drugs, but no one can be sure when he stopped taking drugs, or if he ever stopped.
kennedy was a daily consumer of drugs, and his erratic behavior as president was likely tied to that practice. Besides incapacitating mental function, drug use leaves the president and white house staff open to blackmail.
We can not make the assumption that obama, or any future president, is not a drug user. He and his staff should be required to submit to the same drug screening as all persons with top level security clearances.