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Under the US constitution, an American president has a virtually untrammelled power to pardon, or commute the sentence of, anyone convicted of a Federal offence (but not offences under State law). It is a power completely personal to the president, who can exercise it for any reason, or for no good reason, and it has been used surprisingly often: 1,927 times by Barack Obama, for example. Although there is a government department, the Office of the Pardon Attorney, through which applications for presidential clemency are usually routed, there is no obligation on the president to follow that process.