Oyamel, we checked out their Health Inspection. It turns out an inspection has not been done since November of 2008. However, that report was not glowing.
Health Inspectors said the health risk at Oyamel was "high." They found several food items, including chicken, beef, and guacamole, stored at the wrong temperature. They found food stored on the floor and next to employee's clothing and cleaning agents.
The health inspectors also observed an employee cleaning a dish with a dirty apron right in front of them.
You can check out the full report here. It is, of course, three years old - whether things have improved or gotten worse, we do not know.