A friend told me the story of his friend here in Mexico, who was just finishing school (uni) and needed some money. A friend of his offered that if he stayed at some random house for a weekend (to "guard" the house just staying there to sleep) he would be paid several thousand pesos. Not bad for a weekend of doing nothing.
That weekend there was a police raid to that house. The poor guy ended up being arrested along with others and got 20 years jail time because there were drugs and guns in the house.
Not worth it.