I take no offense. I understand you are in a very difficult situation, but you have to respect the position we are in. We were not there, we can only apply logic and reason to the situation from afar. UPS can be a very difficult place to work. Like other large companies, there is often injustice when people lose their jobs, but extenuating circumstances can and often do change the landscape of rules and bylaws.
Can you imagine how bad UPS would look if it got out that you were fired for trying to save your own life?
Choking to death, smashing a beer bottle to open it so you can save your own life in front of several witnesses is not drinking on the job, period. Anymore than delibrately crashing your package car into another car that is careening out of control into a crowded schoolyard would be considered reckless driving. It just doesn't add up.
Why would anyone who is present in that room be afraid to tell the truth about a situation like that? That makes no sense. You did absolutely nothing wrong, the people who witnessed a near death experience would also be doing nothing wrong by stating the truth. It defies logic that a person in that room would be involved in a conspiracy to see you lose your job.
They didn't know you were bringing in tacos, you are a fellow employee who almost choked to death, how did it happen that you are now considered to be public enemy number one after 16 years in goods standing - Do you think that sounds reasonable for someone who did nothing more than trying to save his own life?
Emergency situations like the one you described do not easily lend themselves to interpretation - it's not like you would have three different stories from three different people. Emergency situations are certainly surreal, they happen very fast, but no one chooses to casually drink a beer in the fashion you described- I can't imagine the unbelievable amount of energy that you must have mustered to try and save your own life-it's more unbelievable that anyone who witnessed that would ever forget what they saw. Corroboration of your story is the least of your issues - that will be easy.
I agree with the others, get an attorney, under oath in a deposition or court of law, those present in that room will have no choice but to corroborate your story. You don't need to ask them anything personally, your attorney will do that. If you are indeed telling the truth, You certainly have a chance to be exonerated in this-if not to win your job back, but just for piece of mind.
It certainly is within your grasp to rectify this situation. Unless, you are not being forthright about what happened.