There has been times where the suspects are presented while holding the weapons they were found to be in possession, as is the case in this recent picture of two sicarios belonging to La Familia that were captured in the state of Mexico. The men are seen displaying two Glock handguns 9mm and an AK-47 or "cuernos de chivo." They are both wearing polo shirts bearing the insignia of the federal police.
It does not get more incriminating than this and not to mention a safety issue when the ammunition for the weapons is within reach. Such is the process in Mexico, have to love it!
The all time classic.