I am NOT a lawyer.....
There is no prohibition in the law for DOL offices. I recall past threads addressing driver license offices and it being legal there.
If it is a state office, you are likely good to go. Worst they can do is ask you to take it outside.
If it is a contracted office, of which there are quite a few, that makes you have to go through private property to get to the counter, they could have their own rules.
Basically, if it's inside another business as a sideline, they could exclude you.
If it's only business is vehicle licensing and is a state office, you are probably alright.