CT-Rich
Contributor
You need to pass the driving test. The State says you have the minimum competency to drive. You could, theoretically get dive gear and go in the water yourself and self instruct. That was how it was originally done. BUT... If you hand someone your gear and tell them what to do to dive and they get hurt.... It won't matter why, they or their heirs will come after you, and probably win.That's like saying why pay a driving instructor to tell you to turn the wheel and step on the gas.
I taught my kids to drive, but the state issued the license. I am off the hook if they do something stupid. The OP's son was given substandard instruction. He can work with him on improving that. If they want to go on charter boat, the Captain can claim the kid was certified and the agency was responsible for the kid's lack of skills. If you don't have the card, their heirs can ask, "why did you let him on the boat?"