First of all, I will never live near a neighbor that is into drug business, that's like risking my life with a person knowing fully they are into illegal stuff and decide the stay near them. What I will do if I have evidence, I will call the police, trust me bro, that's going to be the first thing I will do but if there is no any evidence, then that's like hearing rumors and decide to profile person, it will make me a bad person if I don't see something and then begin to believe what people say about someone, that's very bad to believe in rumors or street talk, I have to see to believe.

Now, when such kind of person approaches me to buy bitcoin, I will teach him how to buy as long as no evidence that money is illegal and by the way, he is using his account to buy bitcoin and not mine, I will teach him andbhow to buy but I wouldn't involved anything that has to do with me, if he is indeed a clean person, nobody will come hunting for his head but if it's illegal, they will come for him, I'm just like a regular person who direct a stranger where to buy something from the market.

It depends on your ethics, so it's rather a philosophical question. If you're a drug dealer, or someone who uses drugs, teaching another fellow about using bitcoin shouldn't be a problem, right?
I don't think drugs should be banned. We should all have freedom to put any substance we like into our bodies? Who's there to say I can smoke, drink alcohol, but I can't sniff coke? When Coca Cola was adding cocaine to the drink it was all good, but then it wasn't anymore because we changed our minds about what should and should not be allowed by the government, our supreme overlords.

IMO anybody has the right to know about bitcoin, regardless of their trade, morals and all that. It's up to them what they do with this knowledge.

What will I do??? I will teach him.
First, what do you consider learning Bitcoin? Helping someone make an investment in Bitcoin is not the same thing as learning about Bitcoin, as Bitcoin knowledge is far above that.
 
Because one is into illegal dealing does not make everything that comes from him completely bad; sometimes we should have a positive mindset towards things.
 
If my neighbor sincerely approaches me and says that he needs some knowledge about Bitcoin, then I will give that to him. What I can't do is go to him and tell him how to run his business or try to talk him out of what he does, nor will I ask him why and what he wants to get involved in Bitcoin. Just because we are living in the same neighborhood does not make us brothers; we should respect each other's lanes, help one another in any way possible, and teaching him how to buy Bitcoin won't do me any harm.
 
The only place where I can see this as something negative is if the neighbor comes to me and asks me how he can use Bitcoin to launder out his illegally earned money, knowing that if I render such help, I could be charged for only God knows what if any case ever gets attached to him.

These stories are somewhat silly, like the story that says; "the neighbor of a neighbor of that neighbor told me...", first of all, if the guy deals in drugs, he is not going to bother his neighbor to ask him about how to handle bitcoin, something like this is achieved in a couple of clicks, on the other hand, if that happens, what he is looking for is something else and it is not exactly that you teach him how bitcoin works.

Finally, we do not have to be bitcoin teachers and even less preachers, a simple does not work in this case, and if possible say it three or four times.

In any case, I think that, as a friend of a friend of a friend said, it is more dangerous for your wife to ask you "teach me everything you know about bitcoin..."

It's not really a big deal, we will always have a lot of ways to turn someone down. You can make excuses that you don't have time, aren't good at teaching others…and tell him that knowledge can be easily found on the internet. I don't think it's dangerous for us to refuse bitcoin education to our neighbors. They may be dealing with drugs out there, but when they're our neighbors, they treat us well, there's nothing to worry about. I think OP and he also have a good relationship otherwise why would he come to OP for help?

It's a pity i have to stumble across this thread after 1 or more years of inactivities.

This is your assumption.not base on fact (not realistic)
Most drug dealers already have means and ways to recycle money.

Maybe, he wants to learn crypto currency in order to invest and quit other non-decent jobs.

** teaching someone who is willing to learn does  not make you take responsibility for his/her actions.

You can just introduce him or her to some basic terminologies and watch out before moving to more complex lessons.

Note: we live in society were we made to suspect every single mosquito bite.

Regards
Btcseo

Since he is a drug dealer, we can consider him as the biggest criminal in the country. In that case you can tell him on your own that you feel comfortable teaching him to invest in Bitcoin. And if you control them and teach him, if he is caught by the law in any way, then he can trap you and you can face danger. Because drug dealers are always looking out for themselves and how to put others in danger. So you try to stay away from your neighbor with various excuses and show him various tricks. So that he does not suspect you that you are related to Bitcoin and ask him to search various social media if you want. Instead of teaching your drug dealer neighbor about Bitcoin on your own, it would be better to ask him to search the many social media where Bitcoin is discussed.

I think the answer is you should try to minimize as much as you can to interact with your neighbor.

Let's say you're don't want to teach him, but when you accidentally meet him, do you think it's good to ignore him and refuse to answer his question? that's unethical and he might have a bad intention to you. Just try to be a good guy in front of him although you're don't like him and don't want to get close to him.

Most of it doesn't matter since it would just depend on you if you want to teach him about Bitcoin then just teach him about it, if you don't want to and you feel like it wasn't a good idea then just don't do it, at the end of the day you're the one going to decide on that. I mean teaching Bitcoin to someone like him wasn't really a bad idea since Bitcoin is Bitcoin and it wasn't illegal to use, buy or sell Bitcoin, there was a possibility that he is going to use Bitcoin on some illegal transactions that involving drugs or whatever then that's on him already, you just teach him about bitcoin and it would depend on him if he's going to use it illegally.

I mean you could just distance yourself, but to be sure if he's a known drug dealer in your neighborhood I would avoid interaction with him since people can easily judge you, and they might think you're involved in drugs as well so its better to avoid him in my opinion, but I guess you can make an exception if he changes his works, then suddenly just want to invest in bitcoin for his future something like that.

Prevention is better than cure, we don't know what the OP's neighbor's real intentions are but the fact that he is a drug criminal is something we need to consider carefully before having any relationship with him. Maybe he won't intentionally harm OP as many people imagine, but if he is caught by chance, OP can also be called an accomplice by the law. So in my opinion, OP should not teach him bitcoin, OP should find a way to refuse or give them other advice like self-study online or finding another teacher...