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Good question. Firms I have worked with have also had the same challenge. I think all law firms need to be assessed in some way, but it should be proportionate, depending on a firms ongoing reliance on them and the sensitivity of any data shared with them. As a general rule
High Risk - Retained external counsel managing ongoing regulatory investigations
Medium Risk - Panel law firms for contract, litigation or corporate advisory work
Low Risk - Ad-hoc local counsel for minor employment or property matters
Therefore, for High and Medium risk services we would perform full scale due diligence, for Low Risk maybe just a NDA and a background check