We had a fraudster cash a check on one of our customers for over 10K. we are filing a SAR however do we still need to file a CTR in this case? the ID used was falsified ID. I'm not sure if the SAR supersedes the CTR in this case.

CTR and SAR filing requirements are not related.

There was a time, decades ago, when you could submit a CTR and check a box on the CTR indicating your sense that the transaction was suspicious. But now, as Randy indicated, the two are not related.

I'll qualify that just a bit, though. If you suspect that someone has structured a transaction or transactions in an attempt to avoid the filing of a CTR, submission of a SAR is appropriate.

We had a similar experience. You file the CTR with the information the fraudster gave you.