Robert "Bobby" Wilkes was a Petty Officer First Class who prior to being assigned to the USS Enterprise was an Emergency Medical Tech. He suffered a meth overdose and was taken to the ship's sickbay where he received treatment for the overdose. Upon Special Agent Leroy Jethro Gibbs interviewing him, Wilkes insisted over and over again that he had never taken any drugs and was even convinced that none of his crew-mates had either. He even believed that the urine test that he had been given was a false positive.