I don't think this will ever end but likely someone will invent some solution to make this a whole lot easier and less stressful.  



Remember many years ago when some nutcase poisoned Tylenol capsules?  That completely altered the way medicines are packaged to this day.



I personally have no idea what the solution to "poisoned" mail will be but you can bet that whoever figures it out will be loved by letter carrying and opening personnel world-wide.