The Cohanim are kosher - but the Levi'im ....?

A speaker at our shul yesterday is the Director of an Institute for Kohanim in the Old City, and spoke about the project to isolate the 'Kohen gene'. The "eureka moment" actually took place in our shul, when 'Kohen' Dr. Karl Skorecki (also, I may modestly point out, a CHAT graduate) asked himself whether he would have a common gene with a Sefardi kohen who was having an aliyyah. The rest, as they say, is history. However, when he had finished, the speaker asked for questions, and was asked about the Levi'im. [This prompted the Rav to make some painful comment about 'Levi genes' ]. The speaker was a little less enthusiastic. Apparently, (and, in fairness, this is clearly spelt out in the link provided) the genetic testing on Levi'im , who should also have a common gene, is a great deal more problematic! So, for Cohanim, the genetic research shows that "Science proves the Torah etc etc" but for Levi'im "the genetic test is a curiosity, and of course it is the halachah that is important" !!