Can my employer dock my pay if I made a BIG mistake?

I work at a car dealership as a oil change tech. I forgot to tighten the drain plug on a car, and a few weeks later the car is towed back in! The engine is toast. My boss is now telling me I "HAVE" to pay the insurance deductible. SIDE NOTE: I make minimum wage in Maryland $10.10 I've read that he... show more I work at a car dealership as a oil change tech. I forgot to tighten the drain plug on a car, and a few weeks later the car is towed back in! The engine is toast. My boss is now telling me I "HAVE" to pay the insurance deductible.
SIDE NOTE: I make minimum wage in Maryland $10.10

I've read that he can't dock it below federal minimum wage....also I planned on quitting soon anyways (As i had another job lined up)

Can I just leave now?
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