CARRYING WELDING LEADS FROM TRACK OVER TO LF #3 HEAD TO BUILD CROSSOVER, HE TRIPPED OVER WATERLINE AND FELL, TWISTING HIS KNEE. HE FAILED THE INITIAL DRUG TEST AT HOSPITAL. THEY FOUND SUBSTANC ES IN HIS SYSTEM THAT HE DIDN'T HAVE A PRESCRIPTION FOR AT THAT TIME. HE LATER GOT THIS CLEARED UP. HE MISSED A COUPLE OF DAYS BECAUSE OF THIS.