Dale S. Brown
Thanks for these tips! It is so important to debunk the magical thinking that passes for wisdom. Still, I think I would be a little more tactful. I would suggest using open ended questions instead of questions that lead to "Yes" and "No."
Here are some I've tried:
Please tell me a story from your experience where X has worked.
What measurements do you use to show your success?
What scientific studies have been published about this? Where is there evidence of success?
Can you tell me about times where things haven't gone as well as you wish they had?