The US policy on glove use is a mix Charles. Most FDA/USDA inspected operations DO require gloves in specific situations, that's solid. However, once you get down to state / municipality - inspected facilities (catering, restaurants, smaller commercial operations), its state / authority having jurisdiction code dependent. Some states require it, some don't see a significant 'need'. Unfortunately for me, most of those states also don't provide Health Inspection Reports online...conspiracy theory or coincidence?
Most policies I've seen on a 'free-choice' facility is based around prevention of cross-contamination of bacteria-prone (high-risk) products, or to assure the public that the server is handling the products he/she is serving with relatively clean 'hands'.
Unfortunately, without proper training, gloves are put on or replaced on hands that haven't been washed. If you observe a deli-counter worker, they usually will pull off their gloves to say, take out the trash or handle a telephone or scratch, cough or handle money, then put on a new set of single-use gloves without washing their hands properly, if at all, resulting in not only compromise of the next 'serving', but usually in the entire box of gloves they just shoved their dirty hands into to get another set.
Regardless of what your specific environment, beginning a glove policy with "always wash your hands properly prior to use" is paramount to any free-choice or required policy, and should be followed by "single-use means single-task". Third should read, "Do not reuse gloves once removed". From there, your policy will probably be unique and subjective to your environment, as Charles states.