Successes: Empowerment of corrupt police and politicians. If the police accidentally kill you, they plant a gun on you. If the police kill you illegally, they plant a gun on you. If the police don't like you, they plant a gun on you. Gun control in Mexico is a way for the corrupt police to do whatever they want to anyone and violate their rights however they wish because they know that all they have to do is plant a gun on you.
Failures: Crime continues to be out of control in Mexico.
Here's a news article posted on a forum that I found, the original story on yahoo was erased.
-three mexican soldiers kill American and plant gun on him.
http://www.militaryphotos.net/forums/showthread.php?191670-Mexico-admits-3-of-it-s-Soldiers-killed-American-planted-Gun-on-body.