Can I ask- what are the indicators?
Ditto. Add me to the mailing list.
When dealing with folks that are obviously not from around where you are, (although, it probably holds true for folks more local as well) and in situations where you would expect different (Bartenders, waitresses, domestic workers, contracted workers in your company, stuff like that):
Showing signs of physical injuries, abuse or malnutrition (especially bruises in various stages of healing, indicating consistent injury over time)
Sticking to scripted or rehearsed responses
No ID or documents (sometimes hard to check for unless you are in an official capacity of some kind)
Living at the job
Living in small apartments with a lot of co-workers
Working stupid long hours
Tattoos and/or branding (especially if all the workers/waitresses have a matching one)
Small children working at business alongside adults (especially if those adults aren't their parents/close family)
Physical security measures that would keep people in as well as out (locks on both sides of doors, or "breakrooms"/employee areas with locks on the outside
Consistent deferring to "manager" or boss anytime you go off script
Literally almost any commercial sex act not in a licensed NV brothel
Having to turn cash or "tips" over to someone or lock in a safe immediately on receipt.
There are more, but that's what I have off the top of my head (with a glance at my notes)
DHS has an indicator card you can download and keep in your wallet that offers several indicators, but they are more geared towards folks that are interacting with and talking to suspected victims.
https://www.dhs.gov/blue-campaign/materials/indicator-card