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Mexican law like most Latin and European countries (with the exception of the United Kingdom) has a  neo-roman legal system. 

All laws are based on the Constitution - when there is a change in a Law, a Regulation or a NOM (official Mexican standard) - the new cancels the old. A reformed law cancels earlier versions - this is always stated in the "Transitorios" or Transitional articles at the end of the Law, Regulation, or NOM. The old law disappears. All laws, Regulations and NOMs are published in the DOF (Official Daily of the Federation) before they become law. Many publications become law the following day, but many give a future date that can be months or years when the new legislation takes effect. This is done to give time for companies and individuals to adapt their programs and actions to be fully compliant when the law, regulation or NOM takes effect.

For example, when there is a new HEALTH AND SAFETY or ENVIRONMENTAL STANDARD published - you are required to adapt your program to be fully compliant on the date that it takes effect.

At www.mexicanlaws.com - we guarantee that all our documents are up to date with all reforms and changes.  If you want to check your documents to make sure they are to date, you can check them on the following Federal Government websites:

DOWNLOAD FOR FREE ANY MEXICAN LEGISLATION IN THE ORIGINAL SPANISH
You can check the date published, or reformed:
FEDERAL LAWS, CODES http://www.diputados.gob.mx/LeyesBiblio/index.htm
FEDERAL REGULATIONS http://www.diputados.gob.mx/LeyesBiblio/regla.htm
NOMs = Official Mexican Standards 
http://www.economia-noms.gob.mx/
NMX = Mexican Standard (Non obligatory guidelines unless they are a requirement in a NOM)
http://www.economia-nmx.gob.mx/normasmx/index.nmx