The food health scandal involving a partially eaten rat head in McDonald's has new updates. Apparently, federal authorities have ruled that the burger itself is rat-free. This puts more credibility into the fast food chain's claims that this incident was an extortion attempt on them.

The Federal Commission for Protection Against Sanitary Risks (COFEPRIS) has ruled that no rat meat was found in the burger. However, they did find some more sanitary issues that still make sure McDonald's Tlalnepantla remains shuttered.

An inspection made by health officials found “harmful fauna” in the restaurant. The presence of flies and cockroaches in the preparation area was revealed by Alvaro Perez Vega of COFEPRIS, Kicker Daily reported.

Other sanitary concerns such as an inadequate food preparation infrastructure were found which risked kitchen utensils getting contaminated with dust and other substances was found, Mexico News Daily reported.

However, investigations by the state Attorney General’s paint a different story. Apparently, burger samples they tested actually had rat meat In them, indicating that the mouse was cooked together with the burger. They have yet to determine if the burger from McDonald's Tlalnepantla was actually bought from that particular outlet.

For McDonald's Mexico, they are using the services of private investigators to find the culprit behind the scandal. They said they will use the full extent of the law to prosecute whoever is responsible as “a serious attack against the (restaurant’s) image.”

Until the Tlalnepantla branch does a thorough fumigation to clear out all insect remains, the restaurant will remain closed, Metro reported. The scandal broke out on November 9 when a man tweeted disgusting images of the half-eaten ratburger. The pictures went viral in a short amount of time. He then went to the public prosecutor's office in Mexico State to file a complaint and brought the evidence with him.