What Ever Happened To Prosecuted?

Because I didn't want to get electrocuted, I couldn't get a clear pic of this sign that says "Danger - Trespassers May Be Electrocuted".

And why "may be" electrocuted?  Is there some guy with a switch back there?  "Hey, that's Arnott."  ZAP!

"It Was 50 Years Ago Today....."