I drank a 12 pack of light beer on Friday night, is it possible to pass my ETG on Monday night @ 67 hours later?

It is possible, just not likely. The length of time that Etg/Ets stays in your system is proportional to the amount consumed and the time between consumption and testing. Even though it is light beer, you did consume a large amount of alcohol and it is going to take quite a while for it to be eliminated. What I can gather is that you're also a heavy drinking, being that you did consume a case of beer in one night, and that has been shown in some people to slow down the elimination cycle.

At this point I would be looking at putting your affairs in order for a possible negative outcome. I don't know why you're being tested, but the majority who ask questions similar to this are prohibited from alcohol exposure due to conditions of parole, employment, rehab, or condition of custody for your children. The outcomes are jail, unemployment, extended stay, or lose of custody. Regardless of the reason that you're being tested, if you're going to violate the reason for your forced sobriety then you should be prepared for the outcomes so that the transition isn't too terrible. Another route to consider is a alcoholics support group for the length of your imposed sobriety.

Good luck.

You will likely pass.

I guess anything is possible, but you should prepare for the worse, while you hope for the best. Sorry guy, you sure didn't prepare well for this test, and I get you are anxious about it, but you had FULL CONTROL of that and blew it.

I wish you luck and you will need it.