It's quite possibly a violation of U.S. Code 1030(a)(5)(A), a federal felony:
(5) (A) [Whoever] knowingly causes the transmission of a program, information, code, or command, and as a result of such conduct, intentionally causes damage without authorization, to a protected computer;
Now "protected computer" and the [ab]use of the Interstate Commerce Clause mean that the device with the FTDI would likely need to be connected to a network for this to apply. Plus I think they still need to show $5,000+ in damage, but it wouldn't be hard to reach that if the driver wrecked a prototype and delayed a product.
(5) (A) [Whoever] knowingly causes the transmission of a program, information, code, or command, and as a result of such conduct, intentionally causes damage without authorization, to a protected computer;
Now "protected computer" and the [ab]use of the Interstate Commerce Clause mean that the device with the FTDI would likely need to be connected to a network for this to apply. Plus I think they still need to show $5,000+ in damage, but it wouldn't be hard to reach that if the driver wrecked a prototype and delayed a product.