I don't think that I would do it on purpose...but if you really need a touch up, go and talk to the stylist first and let her know what you expect, new growth only, protect already relaxed hair, base the scalp, leave the relaxer on for X amount of time, rinse, reconstruct, neutralize, rinse, neutralize, rinse.
Let her know what your steps are. I'm sure that you can tell by the way she reacts if you should let her TOUCH your hair.
Lana