As a teen, I caught copperheads in the hayfields by stepping on them just behind the head with running shoes and grabbing them just behind the head. Copperheads aren’t very fast, but they usually lay in quiet wait to bite passers-by (or often someone who actually steps on the copperhead). IIRC, they sense body heat from prey. They’re not pit vipers and don’t have long fangs. Wearing thick, tall boots and jeans can sometimes prevent effective bites...sometimes.
Copperhead ARE pit vipers.