technically (from both my moral point of view and what i know of UK law (i know ur USA, but shouldnt be too different)), i dont think so. if SA (depending on how bad it affects you) can be ruled as a disability for you, then if the employer did use it against you, they'd be breaking the law. if it isnt going to STOP you from doing the job, then there is absolutley no reason they cant accept you if ur skilled for the job.
it will be different of course if you had no arms and legs and wanted to sort letters in a post office for example, UNLESS you had prosthetic limbs which could function as "normal" limbs.
by UK law, for example, an employer must make resonable adjustments to accomodate for you needs. blah de blah. this is all worst case senario type stuff, obviously. but it still applies.
i dont know US law, but thats my look on it.
they can only turn you down with a REAL reason. and SA is not a reason. it's discrimination. like "black" people, and women. you cant say no "just because". if you can do the job, it's only them stopping you (which is illegal).
look up the law in ur state and whatever. research can go a long way
hope my ramblings helped in some way