Indiana recognizes all other issued licenses, but they have to abide by Indiana state law while here. As for verifying their validity, if that's what you're getting at. I would imagine it's similar to checking out of state driver's licenses.
I am already aware that Indiana will honor/recognize a LTCH or equivalent from not only other states, but from other countries. Though not all such issuing entities have 24 hour availability.
I am fully aware that out of state license holders must abide by Indiana laws, but can Indiana police instantly check on my MI license if I just claim to be licensed? I just assumed they would have a hard time.
Not all CCWs/LTCHs/etc are computerized......and not all states offer 24 hour phone verification.