That seems to be a big question. Seems that a quick does of pepper spray is part of the training, but the union opposes it. I don't have a dog in this hunt, but I'm not sure I think much of the union's argument:
"Any theoretical benefits far outweigh the real risk of serious, sometimes permanent, injury to employees," Kelley said. "Moreover, a brief one-time exposure to OC spray over the course of an officer's career will not make officers less likely to use this weapon nor enable the officer to deal with its effects should they somehow be exposed."
So pepper spray is much too dangerous to expose an employee to -- even once, as part of training. Further, agents are just as likely to use it on detainees, regardless of whether they've experienced it or not.
Does this mean that Border Patrol agents are sociopaths?