If someone inadvertently deposits money into another person's bank account, and the recipient knows both the source and amount of the money that does not belong to the recipient, then to retain the money without notifying the depositor would be criminal embezzlement, because once the recipient is aware that the money is not his/hers, he/she becomes a "constructive trustee" of the money for the depositor, and if he uses the money for his/her own purposes, he/she has committed a theft of the property held in trust.

Hope this helps.

NOTICE: My goal here is to entertain while educating the public about the law. I hope my answer is useful and informative to you. During our conversation, the website may ask you to rate my answer. If you rate my answer lower than the middle rating, then the website retains your entire payment, and I receive nothing. It is entirely your choice as to how you rate my answer. However, because your payment to me is in the nature of a donation/gift, rather than as compensation for any services rendered, you are entitled to know how your rating affects the final distribution of your donation.

If you need to contact me again, please put my user id at the beginning of your question ("To Socrateaser"), and the system will send me an alert. Please Click the following link for IMPORTANT LEGAL INFORMATION. Thanks and best wishes!