1. You don't. But, GMRS licensees should ID without question. Nothing we can do even if we do care, except follow the rules ourselves and encourage others to also. With FRS being able to use the mains now at 2w and the low side splinters at 2w (where they used to be .5w, even though not a lot of radios out there yet to do it...still much Chinese junk people can hap hazardly program with little to no understanding of rules) there will be times that FRS is on a channel and there will be no ID and no way to know. Personally....I share, but if I can tell they are unlicensed, I'll go ahead and use it anyway especially my repeater channel. I am licensed for 25 years, and own a repeater. I share with GMRS users, not FRS people with $18 radios.
2. No license on 462.725 with 40 watts - Illegal.
3. More authority? Not technically sure that exists, but if I follow the rules and I don't *hear* that FRS user on the channel because he is low power anyway....I talk right over them. They seem to change channels after that.
FRS can be used for "Business", but its a poor choice. Toy equipment, essentially, and there is no protection, or exclusivity. An automotive supplier near me learned that, and bought real radios a few years ago. People were interfering with their "operations" by listening for names, etc. and then mimmicking people, causing confusion and chaos. Nothing that they could do about it. Of course it helped that they were so smart that they used FRS Channel 1 and NO squelch code (open squelch). I listened to some of it night after night on the scanner...it got funny, frankly.
Here's a channel guide, it if helps any. http://www.nat-com.org/frs-gmrs.html