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Do query services like Google Finance and Yahoo Finance go back to correct busted and adjusted trades?

In other words, should I re-download yesterday's data if I want to be sure my intraday data accounts for trade cancellations and corrections?

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    If you need that level of detail, you should probably not be relying on a free service which only promises "best effort" accuracy. If that.
    – keshlam
    Aug 1, 2014 at 4:29

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No.

Busts are very infrequent, and if an equity were illiquid enough to be affected, the bust cost would be enormous.

For a liquid equity, the amount of busted volume is insignificant except during a flash crash or flash spike. Then it would be reasonable to redownload.

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