brandon wyne , 17 , and courtney griffith , 18 , were pulled over for broken tail light in virginia beach in january .
police said they could smell marijuana and ordered them out of the car .
wyne agreed but on the condition nobody touch him until his mom arrive .
officer hits him , sprays him with pepper spray , stuns him with taser .
footage has emerged after griffith found it in her deleted folder .
virginia beach pd investigating conduct and evidence tampering .