How much leeway do officers have once they've been dispatched? Are his hands tied and he's required to make contact even though the subject doesn't appear to be doing anything illegal?
Just being dispatched doesn't give you the authority to do something you don't have the authority to do.
Now, being dispatched i.e. informed by a 3rd party of a possible crime is one of the factors that can add up to reasonable suspicion but in and of itself does not necessarily constitute reasonable suspicion.
The way I typically handle it is to ask for clarification and respond to the area. If I observe something that allows me to detain someone and I feel it's in the public interest, I do so.
If I don't observe anything that allows me to detain someone but I still believe it's in the public interest for me to contact them, I contact them with their consent and if they tell me to get bent, I go bend.
If I don't observe anything that allows me to detain someone and I don't see any issue in the public interest, I go get a Coke Zero.
Michael Brown