Yes, from licking an envelope.  It just did it today.  First registered a reading of .013.  I had lunch, then it registered .000.  5 hours later when I was leaving work I noticed I could still taste the glue from the envelope, but didn't think it would still register.  It registered a reading of .026 and would not let the car start.  I waited the three minutes and it measured .024 and would let the car start.  The Intoxalock is on a family member's car.  I drove it because mine was used by another family member.  I haven't had a drink of alcohol in over a week.  This thing cannot be trusted if something like that could result in that large a reading.  I have no doubt I could repeat this procedure.