But we also need to teach them that sustained hypervigilance is dangerous and unnecessary. Just as a single technique does not fit all vehicle contacts, a single mindset--hypervigilance--does not fit all human encounters. We have done very well at teaching officers a range of behaviors to cover a variety of tactical situations, but we have not done as well at teaching them flexible attitudes. As trainers, we have a duty to give our officers all the tools they need to survive. Not every danger is found on the street.