I would request they provide you with information that shows check activity to be considered high risk for money laundering. Most AML systems do not monitor for check activity. Check activity is generally part of fraud systems.
I do recommend that any suspicious activity in and out of accounts be matched to the source/use of funds where appropriate, which could involve checks, but that is not the same as what they appear to be asking for.
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CAMS, AMLP, AKC, K-9