Any company looking to employ people that advertise the caveat that: "unemployed need not apply" are not doing any favors to anyone, as quite frankly, there are very good and talented people that will be unemployed from time-to-time, as well as this type of restriction in regards to reasonable due diligence, is a form of laziness, as if taken to the extreme, than all people at the point of their birth, are unemployed, which would indicate that the person coming up with the concept that the unemployed need not apply, was himself, once unemployed, demonstrating the hypocrisy of the whole thing. While technically, discriminating against one's state of employment, isn't considered to be a federal violation of the law, it, in effect, is definitely discriminatory and obviously hurts those that need and are seeking employment.
In point of fact, too, the "you must be currently employed to apply here" mantra, follows in the lockstep, of winners have jobs, and losers do not; therefore, those that are typically most discriminated against, such as minorities, disabled people, people with health issues, older people, and very young people, are effectively eliminated without even the common courtesy of being able to present themselves and given a reasonable chance or shot at employment.
While, on a certain, sick level, one can appreciate the candor of an advertisement that tells the unemployed to not even try, because that company will not consider you under any circumstances, those that make it a habit to shut the door unfairly on certain people, will, one day, have their comeuppance. Unfortunately, in the meanwhile, those that need jobs are curtailed from getting jobs, even when well qualified in doing so, which smacks of the same type of discrimination to which certain people were subjected to such as: "Irish, need not apply", "Blacks, need not apply", and so forth.
What is especially insidious is that those that recently lost their job, are at their most vulnerable when looking for a new job, so that this type of bias, serves no good purpose, whatsoever, and can be, rather devastating for those looking for employment. The fact of the matter is that kicking a man when he is down has never been considered to be the American way, as, in theory and in contrast, this is supposed to be the land of opportunity.
For those employers that feel that they must eliminate the unemployed because they are unquestionably out-of-touch with the latest this and that, one must respond with the question: does the very act of current employment, prove this theory, true? Signs and advertisements that tell the unemployed to get lost have no place in America, and should consequently be disowned. You should not judge a book by its cover, and if you are to judge, judge a man by the content of his character, his experience, his desire, his drive, his intelligence, his responsibility, his certificates, his education, and all sorts of things that are pertinent to evaluating the capabilities and capacity of a man in regards to the consideration of employment of him.
For those employers that discriminate against the unemployed, for whatever reason, get off your high horse, and recognize, your disdain for those you believe are beneath you or not worth your precious time, are the exact, same people that you must face when that bell tolls for thee.