Midwesterner in Mexico went to the annual Otumba Burro Festival last weekend where one of this year’s rules was “No burro with problems of alcoholism or drug addiction will be able to participate, this is why there will be a Breathalyzer”.
Apparently, there was no requirement to check the burro’s passports:
The Mexfiles has never expected to turn a profit, but personal funds only go so far. Miscellaneous expenses (telephone, internet connection, subscriptions, spyware, hardware repair, etc.) run about 600 pesos (35 US$) a month, and donations are gratefully accepted. Please note that your donations are in Mexican Pesos (18 pesos to the US Dollar as of February 2019). A 25 US$ donation is 450 pesos.
The background of Mexican anti-clericalism and the "atheist" general who led the Catholic counter-revolution of the 1920s 128 pp., Editorial Mazatlán, 2012.
An oral history of the World War II experiences of Gilberto Bosques (1894 – 1997), Mexico 's Consul General in Marseilles, France, who saved tens of thousands from the Nazis. 36 pp. Editorial Mazatlán, 2007 $35 MXP (click the image)
mexfiles.net 
I think being able to dress burros in trousers and t-shirts is an amazing skill.