Vermont

The dog must be on a leash while tracking. The handler will have to have a leashed tracking dog license and the handler will also have to take an examination and pay all licensing fees. Before tracking, a conservation officer must be notified. You are allowed to track at night and dispatch the animal at night if necessary.

State Regulations: http://www.vtfishandwildlife.com/

United States:
Canada:

Green — Tracking allowed
Red — No Tracking allowed
Gray — Tracking allowed under certain circumstances or in certain areas of the state/province, but not all