I remember sitting at a bar in a distant city in some other country one night, and the person next to me, who I had just met that day, suggested that we do a shot together. Now these shots were big, and it had already been quite the night, and I remember thinking, "If I do this shot, it's probably the last thing I'll remember tonight." It was, but that's not the point of this anecdote. This experience gave me the ide…
You give the consultant the drug, then proceed to share your secrets with them and get their expert advice on your issue. Then by the end of the day/week/whatever they'll forget everything you told them and your secrets will be secure.