If it is not part of the Bujinkan, Genbukan or Jinenkan then it will not be genuine Ninpo, and so should be avoided.
I know nothing of Genbukan or Jinenkan, except that they are descended from Bujinkan.
Bujinkan (full name Bujinkan Budo Taijutsu) is headed by Soke Masaaki Hatsumi, a truely formidable man.
I have met and trained with a Bujinkan 5th dan black belt, and I hold him up as one of the top martial artists I have ever had the pleasure of meeting.
So, if you have a club from any of the above organisations near to you, I say go give it a try.
If it is not associated, ignore it as it may well be a McDojo.
Hope this is of some help. Any questions, feel free to ask.
About the only advice I can give you is to go try it out and find out for yourself whether or not it is something you want to learn. I think that is the best way to determine if the art is what you are looking for, keeping in mind all the ups and downs it presents.
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To Shin Do is also an art descended from Bujinkan. It was founded and headed by Stephen K. Hayes who is best known as one of Hatsumi Soke's first American students. I don't know that I agree with these being to only legitimate lineages though. Considering what the ninjas stock-in-trade was I find it hard to believe that Togakure-ryu is the only survivor. I do believe that there are probably more charlatans than there are real ninjutsu practitioners though. This goes for many other styles as well.
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strengthen the body, expand the mind, free the spirit
dragon punch kitteh pwns u!
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Michael P Rowe
"Amateurs talk hardware. Professionals talk software. It doesn't matter what's in your hand or between your legs. It matters what's in your heart and in your head." - Lt. Col. Dave Grossman
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