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PETERBOROUGH, Ont. – Dean Del Mastro’s lawyer sought to poke holes in the electronic evidence at the heart of the case against the MP on Monday, suggesting that emails and invoices might have been changed, either on purpose or inadvertently.

Lawyer Jeffrey Ayotte suggested possible alternative explanations to Cpl. David Connors, an RCMP computer forensic expert who had extracted records from the laptop of Frank Hall, the key witness against Del Mastro.

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Last week, the Crown and Connors laboriously worked on establishing the time stamps on the documents, drawing on a forensic analysis of electronic signatures that appear to show when the files were created and modified.

On Monday, Ayotte focused on apparent discrepancies in the records and the possibility that they might have been changed, either by someone attempting to do so, or as the result of a 2009 power surge that caused computer problems for Hall’s company.