This paper has the purpose to highlight the importance that Colombian Constitutional Court gives to the environmental precautionary principle, in the arguments that this Court presented to decide that the regulations referred to presumption wilfull misconduct or fault and the reverse proof of responsibility, in the legal procedure for environmental sanctions, agree with Colombian Political Constitution. That`s why some aspects about environment legal protection will be exposed, then an approximation of the environmental precautionary principle, concluding with the Law 1333-2009 and finally the Pronounce Sentence C 595 of 2002 will be analyzed.