I found out about this from a friends Facebook post about a Daily UK Mail article referencing a KHOU story: Border residents fear message on mysterious billboards.
Okay, a vandalized billboard which has "Silver or Lead" in Spanish and a mannequin hanging by it's neck, This does not rate as national news? Fox, CNN, Reuters and AP I all personally checked, and none of them have any mention of it.
If this was not done by the Mexican drug cartels, this was done by people friendly to them. This is being read as a message directed to police officers to either accept payoffs and look the other way, or the people responsible for these billboards will help officers who refuse the silver (and probably their families) get a dirt nap. And just where is Border Patrol? Where is the Army? Obama has lots of things to say about "#BringBackOurGirls" in Africa, but nothing to say about taking care of our Southern border and protecting LEOs.