Would it technically be possible to get away with it today? *spoilers*
I mean, if you are a plain guy making let's say 30 000 - 60 000 $ a year, how could you possibly launder more than a million bucks? Would it be possible just to walk into a bank on some Caribbean island or Switzerland with a suitcase and deposit the money? Buying expensive stuff with cash would seem very dubious in our current electronic world.
The scenario in the film sounds corruptly lucrative, but very difficult unless you're not a mobster.