Charlie Sheen Passes Fourth Drug Test in Four Days, Challenges Brooke Mueller to Do Same

Just hours after Charlie Sheen's kids were taken by police Tuesday night, the actor has taken and has passed another drug test.

RadarOnline.com reports that the star took his fourth drug test in four days, and the site has video proving he passed. The test turned up negative results for the presence of marijuana, cocaine, opiates and methamphetamine.

Sheen allegedly recently threatened estranged wife Brooke Mueller, saying, "I will cut your head off, put it in a box and send it to your mom." The threat prompted Mueller's lawyer to get a temporary restraining order against Sheen, preventing him from seeing Mueller or their twin boys, Bob and Max, almost 2 years old.

After presenting possible evidence Mueller may have been using drugs very recently -- and alleging she still is "I'll match her test for test -- I have nothing to hide. Brooke's gonna be doing a whole lot of these." Says Charlie. Why did Sheen happen to have a drug test handy? He told Radar it was "just in case someone rolls in."