It’s an educational test, not a proof of knowledge.
If you came away knowing not to vent, to use the right refrigerant, not to vent, to take your waste to the reclaimer, not to vent, to leak test with nitrogen, not to vent, and that you can be fined $43,000/day for not having your paperwork in order… then it worked enough.
Technically, yes - "de minimis releases" are allowed because there's no practical way to avoid them. This is the small amount of refrigerant burped out to purge hoses, for instance.
This is downvoted but got a chuckle from me. Recently had to replace a radiator on a vw TDI and had a remove the A/C line, there was a little bit of venting that occurred (the A/C didn't blow cold before so thought there was little if any refrigerant in the system).
TLDR I suck!
I don't think there a mechanic out there who doesn't make doesn't accidentally break the integrity of those flimsy AC lines weekly. They are thin walled pipes, and connected with tiny green O-rings.
There are no standards on how many pieces of thin walled pipe a vechicle can use. It's usually a spiders nest of hoses.
You need to change you blower motor, or do anything that involves the dash, radiator, you are taking a calculated risk. Most mechanics might have a recovery system, but it's usually in the corner of the shop covered in dust.
It might help if the federal government standardized parts for the AC system?
I'm very careful, but the last time I changed my blower I borrowed a recovery system, but still made a mistake, and released all the gas. I was going to recharge it, but the generic evaporator core outlet to an ac line was 1" short. I had to go genetic because I couldn't find OEM.
And no don't make a mechanic's life harder with a bunch of regulations. They are already over regulated, and it's a hard job.
If you came away knowing not to vent, to use the right refrigerant, not to vent, to take your waste to the reclaimer, not to vent, to leak test with nitrogen, not to vent, and that you can be fined $43,000/day for not having your paperwork in order… then it worked enough.