That's perfect.
What I do when people make claims like that, is then pin it down.
Then you say, ok, let's see that controlled study, published in a peer reviewed journal.
I ask to see it, and never stop asking.
Either they are being lied to, or they are lying, or distorting.
Then one can analyze the study, and see what it says. (Its either a lie, or a bogus paper).
But regardless, if he gives you a link or the name of the study, please post it.
I find catching people in a lie, or falsehood, in person, can work really well.
He may be being lied to, and this may go into his memory bank.
By the way, below is a fun analysis of Landmark, using their own jargon to show you why no one should take Landmark!
It gets religious at the end, but up to the religious part, its a wonderful clean argument.
"My Experience with Landmark Education"
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The Anticult
Could you imagine if they did a controlled study on homelessness and Landmark?
Take a random group of homeless people, send 1/3 to Landmark, 1/3 to a legit homeless program with job-training and support services, and 1/3 as a control group.
That is all they would have to do.
Landmark has probably secretly tried tests like that using regular people, and they all failed horribly, that is why there are no proper published studies.
They probably end up much worse than the control group who does nothing.
Landmark is a simple-complex Confidence Trick. Its Werner Erhard's self-replicating money-machine Confidence Trick.
My friend claims there is some landmark study that say's 99% of people who have done the course had a postive outcome from the course. I think it's BS.