I am at the final phase of Border Patrol job.  Polygraph was scheduled for last Friday.  I called and rescheduled while still in the parking lot. One of the other applicants I met during the process came out mad as hell while I was in the parking lot.  He worked 10 years for a large PD and said he failed the polygraph test.  I asked him what went wrong and he said what did not go wrong. He claimed the person giving the test seemed unsure of himself and whenever he asked a question he got testy. 

I have not given notice to my agency as I said I was going to explore this and maybe go all the way.  Now I am thinking I should stay put as if I fail they will call my employer and I will be out in the cold. 

Should I take the chance, or fold my cards and not put in my final notice??