"It is critical that your respective agencies work together to better protect these public servants and ensure the security of our mail system. The motive for letter carrier robberies often is the theft of master or "arrow' keys, and instituting a pilot program to update cluster boxes with new technology could only improve this dire situation. The prosecution of these crimes is also an important means of holding armed robbers accountable for their criminal activity and deterring future robberies. I urge DOJ to prioritize enforcement of these statutes and all other provisions applicable to these reprehensible assaults on the men and women who deliver the nation's mail."