code/datums/helper_datums/teleport.dm

/proc/find_safe_turf	Attempts to find a "safe" floor turf within some given z-levels
/proc/is_safe_turf	Checks to see if a given turf is a "safe" location. Being safe requires the following to be true:
/proc/check_teleport_valid	Validates that the teleport being attempted is valid or not