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Arrested? No, they would need to establish that I am a flight risk (which I am not). Besides the fact that I did not break any laws I find the idea hilarious that the police is waiting at a local McDonalds to catch some bitcoin traders.
Technically if in US you could be seen as money launder. But they don't seem to enforce this much on individuals. They go for the exchanges it seems.
Nope. If you tell me you got the bitcoin by hacking or selling drugs, Ill just get a coffee and head out. Deal is off. Besides 10k USD is a bit out of my range.
(a) Whoever, in any of the circumstances set forth in subsection (d), knowingly engages or attempts to engage in a monetary transaction in criminally derived property of a value greater than $10,000 and is derived from specified unlawful activity, shall be punished as provided in subsection
https://www.law.cornell.edu/uscode/text/18/1957Biggest time was around silk road take down they did go after people on money laundering. Look up Charlie Shrem, he did get some serious trouble for what they considered money laundering.

One runs a big company and failed to report substantial transactions that knowingly came from drugs deals, the other is just two people meeting for a private exchange of a reasonable small amount. I would think that in person exchanges rarely involve over 10k USD or the regional equivalent.