The CRA's income tax system actually validates just about every piece of information that comes in. If our system can see that there is an error, it automatically generates a new notice of assessment for the individual to get the taxpayer additional funds, or not, accordingly. All of those verifications take place. There aren't any more verifications that take place if someone puts something in on paper. Just as an error on paper would be, the same errors will be caught if someone files electronically.
On May 7th, 2013. See this statement in context.