Wiktionary
n. (context finance slang English) a person who transfers stolen money or merchandise from one country to another, either in person, through a courier service, or electronically
Wikipedia
A money mule or sometimes referred to as a "smurfer" is a person who transfers money acquired illegally (e.g., stolen) in person, through a courier service, or electronically, on behalf of others. The mule is paid for their services, typically a small part of the money transferred. Money mules are often dupes recruited on-line for what they think is legitimate employment, not aware that the money they are transferring is the product of crime. The money is transferred from the mule's account to the scam operator, typically in another country. Similar techniques are used to transfer illegal merchandise.
Mules recruited online are typically used to transfer the proceeds from online fraud, such as phishing scams, malware scams or scams that operate around auction sites like eBay. After money or merchandise has been stolen, the criminal employs a mule to transfer the money or goods, hiding the criminal's true identity and location from the victim of the crime and the authorities. By using instant payment mechanisms such as Western Union the mule allows the thief to transform a reversible traceable transaction into an irreversible untraceable one.
Money mules are complicit, and risk criminal prosecution and long jail sentences. Commonly, they are recruited with job advertisements for "payment processing agents," "money transfer agents," "local processors," and other similar titles; the real benefit to the criminals is not the work carried out by the mule, but that the criminals are distanced from the risky, visible, transfer. Some money mules are recruited by an attractive member of the opposite sex. Candidates are asked to accept funds and to forward them, less a relatively small payment for themselves, to a third party, which they can do from home. Legitimate companies use escrow services for this kind of work. Criminals trading in stolen or illegally acquired goods use similar tactics to recruit mules who receive packages and forward them to mail drops not traceable to the criminal.
Usage examples of "money mule".
And if he did get stopped, the local cops would just assume he was a money mule and confiscate the cash.