Several years I took a lengthy, intensive self-defense course taught by campus and local police that was based in Krav Maga. It was amazing. I'd quite like to take some additional instruction, but am wary of the "McDojo" offerings.

Does anyone have any suggestions for "vetting" a school or instructor? Is any one oversight organization better than the others? Are there particular affiliations I should look for? General guidance would be most appreciated.

I'm on the VT/NH/MA border and frequently travel to Boston if anyone has any specific recommendations.

Thanks much.