I don't drink so I've never flunked the breathalyzer however they sent me an email at the beginning of winter it said that you could remove your device to keep it safe so I did after turning off my car they gave me a lockout because they said I did it while my car was running kind of defeat the purpose right! Then I had my ground wire broke which killed all of the power even though the battery was good and I still charged me $75 for a lockout. So I've had $150 for nothing! I would never recommend this for anybody and had I known it had such bad reviews I would have never gotten the intoxalock myself. Horrible horrible horrible horrible service horrible deplorably horrible!