Your information is not correct. It is NOT against the law to be under the influence while in possession of a firearm, that was done away with two years ago.
It is a felony to be foolish with a firearm while under the influence though.
If it is in a holster on your hip, no law is broken.
I do not believe it is wise to handle firearms while drinking, that however does not make it against the law, nor does it mean I think it should be, it means only what it says.