Why does the police officer apologize for stopping gatsby?

When Gatsby is stopped for speeding, he flashes a white card at the policeman. The policeman apologizes profusely and does not give Gatsby a ticket. Obviously Gatsby has great sway with the police and is seemingly above the law. This fits in with the corruption and excess which defined the 1920's.

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B. science that right and i’m sure about it

Yes, just because one had a disability doesn't change the meaning of the word. they would most likely have an (whatever language) sign language to sign what's going on. it would be the same even if he was blind.