According to the police in Kaiserlautern, Rhineland-Palatinate, the 26-year-old man was noticed by a patrol car because he had been driving a vehicle and using his mobile phone at the same time.
When the officers approached him, they suspected he was under the influence of drugs and decided he had to take a drug test by providing a sample of his urine.
But when the man gave them the sample, water instead of urine came out.
Though the penis looked rather authentic, the police weren't easily tricked.
After they noticed that the plastic contraption had been strapped around the man's body and that he was dizzy, they demanded he take a blood test.
Eventually the 26-year-old admitted to having injested cannabis and amphetamines.
Investigation proceedings against the man are underway, the police reported.