<p><br /> Charlie Sheen has gone to extreme lengths to prove he is drug-free, claiming he has "nothing to hide".<br /> </p><p><br /> The 45-year-old has taken a drugs test on camera for an American celebrity website.<br /> </p><p><br /> The actor invited a crew from showbiz site RadarOnline.com into his Los Angeles mansion where he tested negative for marijuana, cocaine, opiates and methamphetamine.<br /> </p><p><br /> It took place after a judge ordered Sheen's two young sons to be removed from his home after his ex-wife obtained a restraining order.<br /> </p><p><br /> It is the latest twist in the drama surrounding the Two And A Half Men star.<br /> </p><p><br /> Last week the show was cancelled for the rest of the series.<br /> </p>
