Criminal Law: Yes to Level 2. Yes to teaching a layperson. It would take a while, for sure, but it's doable. Some of the work requires an understanding of a different lifestyle; if you can't see the potential issues with prosecuting a robbery by a prostitute and her armed male friend, or you can't predict that a domestic violence victim will have a non-credible recantation, you'll need some other education.

I've done a lot of instruction in this field. It is common for instruction not to take until there's other experience in the field which helps things join up.

Bridge: Yes to Level 2. Possibly to teaching a layperson. The ability to play bridge well is correlated heavily to intelligence, but it also correlates to a certain zeal for winning. I have taught one person to play very well indeed, but that may not be replicable, and took years. (On an aside, I am very likely the world's foremost expert on online bridge cheating; teaching cheating prevention would require teaching bridge first.)

Teaching requires more than reasonable intelligence on the part of the teachee. Some people who are very intelligent are ineducable. (Many of these are violators of my 40% rule: You are allowed to think you are 40% smarter/faster/stronger/better than you are. After that, it's obnoxious.) Some people are not interested in learning a given subject. Some people will not overcome preset biases. Some people have high aptitudes in some areas and little aptitude in others (though intelligence strongly tends to spill over.)

Anyway, I'm interested in the article. My penultimate effort to explain something to many people - Bayes' Theorem to lawyers - was a moderate failure; my last effort to explain something less mathy to a crowd was a substantial success. (My last experience in explaining something, with assistance, to 12 people was a complete failure.)

--JRM