Jurists and the press regularly question the quality of the English versions of Québec laws, which are translated from French. We propose, within the framework of corpus translatology, a tool-based analysis of the informational deviations on the entire corpus of nearly 13 million words found in all consolidated statutes of Québec (6.46 million in French; 6.45 million in English). We focus on heteromorphic and non-standard segment pairs screened with the help of two metrics: ratio of standardized translated information precision (STIP) and standardized Euclidean distance (SED), respectively. These metrics are based on the standardized value of three features of the source and target segments, namely the number of characters, the number of lexical words and the number of grammatical and lexical words (total words). Manual examination of a large number of heteromorphic and non-standard segment pairs (automatically screened with these two indicators) highlights the variety and complexity of the techniques used by translation professionals in informational translation deviations, and reports a tiny number of 8 translation errors characterized by the complete omission of either source or target segment. Our data suggest that the translation of Québec law texts fully meets the professional translation standards of the legal translation field of specialization. The analysis of the pairs of segments screened also confirms the significant role played by redundancy and ellipsis in translations as well as their interference in the analysis of explicitation in translation, just like all constraints of a phraseological nature that occur in translation operations and which compel translators to transgress the norm of isomorphism of the information content of translations.