Do law departments agree to Martindale-Hubbell listing?

At the start of their Martindale-Hubbell entry, many law firms parade some of their prominent clients – or that is the impression given. Yet all that those lists show are the names of the companies, so it is impossible to know whether for any one of them the work was sizeable or repeated or recent or in more than one practice area. The partners who ran the projects might have retired, changed specialties, or left the firm.

I wonder whether the firms obtain permission from their clients to cite them (See my post of Sept. 21, 2005 on the carrot of allowing firms to use your company for publicity.). I doubt that clients ever confirm the accuracy of the claims.