He can’t lie to save his life?

Ok so I have a friend who constantly gets himself into trouble for telling the truth. He couldn’t lie to save his life. Now what I’m going to tell you is ridiculous but please don’t hate on me. So he smokes weed for a bulging disc in his back only smoked it before bed. 6mths ago we was pulled over by the police they did a breathalyser on him then let us go. Just as the officer was getting back in his car. My idiot friend told him he smoked weed. He was arrested on the spot. Fast forward 6mth he's now absolutely destroyed his own life & is banned from driving. Please someone explain why he did it. Why on this earth did he deliberately grass himself up.
He can’t lie to save his life?
Add Opinion