For all our gringo readers, this sticker translates to, "Police, asshole." It's a great sticker to have, especially because you can expect people to ask what "cabron" means.  That'll lead to a funny reaction. 

• 4" by x 1.4" Sticker
• It's a patch too
  
• According to Google, Cabron can mean a lot of things including bastard, shithead, and more!