My assumption is that it can be seen easily but I have no first hand knowledge of that. Is it even worth worrying about?
I wouldn't think so. As mentioned, the laser isn't a flashlight, it's not going to be on all the time, etc. Even given the possibility, the backtrack is no different than that of a flashlight beam, which apparently few if any seem to worry about. And in the FWIW category, Todd Green (formerly with Beretta and Sig) found with his testing that unless the other guy was within a cone about 15 degrees of the laser it was pretty much undectable by the BG.