I don’t think it needs to be a worry, but it doesn’t hurt to ask direct questions if possible when you’re dealing with a priest you don’t know in a situation outside a parish or Church-sponsored environment.
Catholicism isn’t the only denomination where legitimate clergy wears, or might wear, a collar. Even if there were no imposters running around, you still couldn’t be absolutely sure that someone with a roman collar is a Catholic priest.
My statement “One thing more to worry about” was “tongue in cheek” kind of statement. I live in Kansas in a community with 2, and only 2 priests and another 1 in the closest town. I know all of them very well, and am familiar with most of the priests in Wichita, if not be sight, at least by name. I worked for the diocese for many years. I know where this diocese sends young men to have their seminary educations etc. which might be a possible interview question in case of doubt. I also know that other denominations have men in ministry who wear the Roman collar, but they often have a wedding ring on the 3rd finger, left hand - as might a permanent deacon who is a Roman Catholic. Does that complicate things? Not really.
I thought, after I posted my almost cryptic statement, that someone would think I was serious. Sorry. But thanks for your concern. I just found it interesting that others had encountered situations of a priest impersonator especially in a (secular ?) hospital setting. I suppose the solution for that would be to ask who the “Catholic chaplains” are for that secular hospital and have a family member or one’s self, check with the diocese as to if or not the “chaplain” is sanctioned for this position. I can’t imagine that situation in a hospital that bears the name of Catholic. Wichita has a very large Catholic hospital system, Via Christi, and names of priests assigned there are in the forefront of information supplied to patients.
All the if’s, and’s or but’s can go on and on. I guess the solution is just “Be aware”.