SDR is short for Surveillance Detection Route.
Jason states that the courier is not a true believer because they found a pack of smokes on him. The Taliban have an extremely strict, often warped, interpretation of the Quran, the biggest of which is the incorrect statement that the Quran instructs Muslims to kill nonbelievers. They also have a strict interpretation of the Quran's instructions on keeping the body pure, as such the Taliban do not approve of smoking, anyone caught smoking by Taliban police would often be beaten. Following the US withdrawal from Afghanistan in 2021 the Taliban regained control of the government and restored their previous laws, including the ban on smoking.