Truly sorry about the loss of the Deputy!!
As a retired LEO ( disabled in line of duty ), I get a kick out of the various posts on the web, including this site, unfortunately, where all LEO's are lumped together as donut eaters, corrupt,lazy, inept, etc. etc.
Truth is, it's one of the few professions that deranged folks seek out to murder, either through mental illness, "suicide by cop", pure anger, etc. etc.
To paraphrase Kermit the frog, its's not easy being green ( or blue, etc. ).
I hope your son has a long, fruitfull, and safe career!! Remember, NO SUCH THING as a "routine call"!!
Mark