Raw Salmon on a green cutting ( RTE ) board
I don't care if it is legit, it is unwise. 

You do not train people to use these incorrectly, for several reasons:


Next time they will be sloppy with other colors as well
Someone who did not know this happened will 'lend' the board for further use with vegetables (between dishwasher cycles)
As you correctly said, someone who did not know, will wash it at too low a temperature or too short
You will arouse suspicion about the hygiene in your kitchen, if anyone sees this