You must hold these truths to be self evident. There are restrictions and guidelines that must be followed to an absolute. You will abide by the laws of Arizona. If you choose to arm yourself, you will do so for the purpose of self defense only; you will never have to take action to defend yourself, for you will abide by the rules of no contact and no engagement. (By the way, no weapons are allowed in the Coronado National Park, but we will not be working there, so no need to go any further).
No weapons in the San Pedro Riparian area near the San Pedro River. There are plenty of hilltops on which to perch, spot and report. Most of the time the illegal aliens will not even know you are there, and you always have the advantage of the high ground.
If challenged, you will physically remove yourself from the situation. At this point 'tis better to retreat and preserve the ability to return and fight another day. The idea is for your sidearm to remain holstered for the duration of your visit. There will be absolutely no need to ever remove your firearm from its holster - not for cleaning, not for show-and-tell, not for any reason. By never removing the firearm from the holster, never keeping it chambered and always keeping the safety on and keeping your hands away from it, there can be no accidents. End of discussion. Remove the firearm from the holster for any reason, and your group members will likely send you on your way back home.
Stun guns, mace, pepper spray are alternatives for personal safety, but remember you have agreed to abide by a no contact, no engagement policy, so your safety will never be an issue. Right?
Absolutely you will not bring handcuffs our other devices used for the physical restraint of human beings. You will not be coming to Arizona to engage in philosophical discussions. You will not be coming to Arizona to challenge anyone, any idea, any person -- your challenge is with yourself. Your challenge will be, simplistically put, to behave yourself.
The mission is clear - Restraint, Responsibility and Character are the qualities that will guarantee success.