Hostiles normally use some form of pre-attack surveillance — whether rudimentary or professional. This may be short-term surveillance e.g. perpetrated by an individual opportunistic criminal looking for the best time to strike, or a high-level, multi-person surveillance team on a high-value target for hostile intent e.g. kidnap or murder. The PST will also be set-back from the Close Protection Team and will likely have more of an over-arching perspective, able to dynamically risk assess without being caught in the weeds.