or is it more like all non-business accounts are Low unless they have a high risk occupation or other red flags?
Exactly.
From my policy:
Low RiskGenerally, the customer’s account activity is normal and expected for the type of account and/or profession/business – minimal cash activity. The majority of the Bank’s customers fall under the “Low Risk” category.
• Required Monitoring: All employees who have contact with the customer are responsible for monitoring activity to ensure that transactions are commensurate with normal activity associated with the account. Additionally, various system reports are reviewed and monitored by branch and department personnel. Any unusual activity detected on either an account or report is to be reported to the BSA Officer. The BSA Officer will initiate a risk rating change if warranted.
I then have a long list of Red Flags (found in the BSA Manual) & Other Risk Factors that we made up based on the classic Geography, Products, Transactional Activity ... yada yada