We have an individual customer that is an employee at a liquor store. The liquor store is also a customer.

The individual has been making frequent cash deposits. It appears he is skimming from the liquor store.

Can we say any to the liquor store owner regarding our suspicions?

How would you do this without violating your customer's privacy?

Sure, if you're right and it can be proven. However, it's slander if you're wrong or it can not be proven. Filing a SAR, even a voluntary SAR, may improve your position for telling law enforcement about your concerns.

Note, you have no evidence, just a supposition. This is thin ice.

Thanks! Thought ice was thin also. We will file SAR for suspicious deposits. Silent to owner.

You can ask the employee of the liquor store for the source of the cash deposits and depending on his story, either ask for some documentation or just tell him the bank is not comfortable with the cash deposits and will no longer accept them.