Abuse

"When [legal] power is given which may be easily abused, we ought always to presume that it will be abused, and although it is possible that great precautions will be taken at first, those precautions are likely to be relaxed in time. We ought not to give powers liable to very great abuse, and easily abused, and then presume that those powers will not be abused."

~ John Stuart Mill, from his Testimony on the 1871 Contagious Diseases Act [hat tip Stephen Hicks]