Yes, the war on drugs is probably unnecessary and ill-conceived. And no, it's not illegal to put a secret compartment in your car.
But it's patently obvious that Anaya is a criminal and engaged in criminal conspiracy to traffic narcotics. He quoted the capacity of his compartments in "kilos." He witnessed $800,000 in the compartment and subsequently increased his rates specifically because he knew it was a shady affair. Most damningly, he tried to isolate himself from information (if you don't suspect a client of being a criminal, you don't instruct them to avoid talking of their usage). In what world is someone who willfully helps drug dealers to conceal drugs not an accomplice?
Do the people in this thread think that getaway drivers on bank robberies should get off scot free because driving a car is not itself a crime?
Also, the Wired editorializing is way off base. If you are truly operating in an information void from your clients (without suspecting them of being criminals), that's not illegal. (Toyota can't be prosecuted for drug trafficking just because some drug dealers use it for that.) But when you have a personal relationship with clients who make it pretty obvious that they're engaged in criminal activity, you absolutely have an obligation to stop assisting.