People like you make me sick!
A company does not have to tell you their interview techniques prior to an interview, and I am sure it is not illegal to have 3 people interview you.
The more people that can interrogate you, the wider opinion they have on a candidate.
Obviously, you are suffering from sour grapes, because you failed the interview.
It appears that maybe the interview panel found flaws in your suitability for the job.
Get a life, and stop making excuses for not getting a job. Rest assured the courts would laugh at your suggestion of "foul play".
No one likes a sore loser!
