As I stated, I did speak with a lawyer. He is the #1 medical licensing lawyer on the East Coast. And you are incorrect on basically all points. An expulsion=expungement. And an expulsion/expungement will not hold up in licensing. Most states ask about ANY arrests even expunged ones, which I will have to answer "yes" to. Some states don't ask about arrests, and I won't have to answer "yes". Maybe your friend was in one of those places. But the expulsion had nothing to do with why he could omit it.
OK, for the umpteenth time, in the state of my example, absolutely you are 100% permitted to answer "no" to the issue of the particular arrest--if in fact it was only one arrest and it was properly expunged. The person who had this done has NOT had a problem with either license in two states. What's more, if for some reason it does show up and you answered "no," as you are allowed to do, you are not considered as lying or misrepresenting---you have the force of the process behind you--if it was done right and you have not had any other arrests or such. This is is an indisputable fact. It doesn't matter if your lawyer is the no. 1 medical licensing lawyer if he doesn't understand the process and how it works in the particular state in question. The lawyer to which I refer is also on the EC. There are many states on the EC. The paperwork and process is lengthy. I don't mean to be a stickler on this, but in fact it is true for the state I refer to--a
nd it hasn't been a problem with re: to professional licensing in an adjacent state, where the professional holds a professional license as well.
Apparently some folks are misinformed or someone is confusing how it works in another state--this is why you have to be clear on how it works in the particular state. Again, you have to consult a reputable attorney that is experienced in this in the particular state in question. Once the process is completed, the paperwork clearly states that you may answer "no." It is not lying at the point. The process gives you the legal write to say "no," if there is no other issue of arrest or conviction, etc. It's for folks that have been caught in a bad situation, and it's unfair to hold the arrest, for example, against them b/c it's bogus. A judge and others in the processes have granted you the right to in fact nullify the arrest by saying "no." Once more, it is not something that can be used by everyone or used repeatedly, b/c one has to meet a bunch of criteria for its use.

and hitting head against the wall. Bottom line:
IF by any means, the record pops up, and someone tries to say, "Ah. What about this? If "this" is the particular thing for which you received a legal expunging, you can't be dinged for answering "No," b/c a judge and law enforcement admin, and the legal process for that particular arrest says you can't. Basically it was looked at and found to be nullified, and you are not considered a "Liar, Liar, pants on fire" person for writing in "no." You are granted the right to say "No," by virtue of the legal approval and processing.
[Each jurisdiction whose law allows expungement has its own definitions of expungement proceedings. Generally, expungement is the process to "remove from general review" the records pertaining to a case. In many jurisdictions, however, the records may not completely "disappear" and may still be available to law enforcement, to sentencing judges on subsequent offenses, and to corrections facilities to which the individual may be sentenced on subsequent convictions.
] http://en.wikipedia.org/wiki/Expungement
Note that the above is referring to subsequent offenses. In the event of those, this record could be opened. Again, this legal remedy is of no value to those with a repeated pattern/s of offense.
Now, in the situation I give, inn particular, I am referring to an arrest record. As to the specifics for a conviction, that is more involved and I cannot speak to that based on the information given to me.
If one has a record or develops a record, especially for some arrest or crime of similar nature, the whole expunging will not have any real value; b/c there is a pattern and the expunging is basically a one time deal and your record before and after had better be cleaner than clean. The specifics of how in works in particular states varies, but even if a federal entity sees it and doesn't pass over it b/c of the legally applied process, when it is brought out, it's going to kind of make the inquiring party look like idiots if they make a deal out of it--especially if there is no criminal arrest or conviction or such prior to it or after it--b/c a judge had declared it as valid. So if someone wants to waste a lot of time and aggravation over it, fine, but apparently this hasn't been a problem for the person to whom I refer. He has not had it be an issue for professional licensing in either states. Of course, his record is otherwise pristine. That's really the ultimate key here. Well, two major things: one's overall record and whether the process has been legally handled correctly from beginning to end of the process, which again, appears to take a long time. I belief the person to whom and the lawyer said it can take about a year or so. So, apparently it is best to have have a good, knowledgeable attorney following the prescribed protocol and babysitting the process from beginning to end--someone who doesn't miss a step. She/he stays on top of it as the client waits for it to be fully cleared and completed.
Mama Mia!