Anything thay has been in contact with the chicken before cooking should be considered contaminated, unless it also has been cooked (if it is food) or washed.
So if the marinade sauce was with the chicken during cooking, it should be ok, if not, then no.
If it was cooked with the chicken, it's fine in so far as it won't make you sick; but depending on what the marinade is it might ruin the texture of the meat. Acid heavy marinades like straight lemon juice can end up making it gross if left in long enough.
Ah k, i didnt use lemon, i just rinsed with water and marinated with a vinaigrette (dont think it has lemon). In any case, i poured it out and ill find some other use for it i suppose
If it contains vinegar it would cook your chicken even further, I never tried it but I would guess that it would rubberize the chicken overnight. Not to mention all of the bacteria the marinade got from the previously uncooked chicken would now be festering on the cooked one.
I had this same exact conversation with my father in law years ago. He will always believe that I was willing to keep the runoff from the uncooked meat until the day he dies.