How to find out whether I'm on a countries black list?

ok, i'm not sure 'black list' right term. in fact, i'm pretty it's wrong term, have heard if commit crime in foreign country , leave country (or along lines) may not allowed in.
query sort of similar:

so, year ago in nepal. want go nepal, worried/paranoid when arrive passport make hollywood style pop-up on guards computer , i'll arrested or something...
because when in nepal last, met nice man who's family stayed short period of time. gave me big candle said child had made me. kind gesture. anyway, couldn't fit in backpack fedexed home uk day before left nepal.
fedex need passport details imports/exports things... emailed me few days after left candle them, time home in england. said needed go office , talk parcel or , couldn't tell me why...

spoke man gave me , turns out candle contained quantity of hashish inside... yeah... not fault right.

arrested attempting smuggle drugs out of nepal if ever go back!? there way can find out whether on list? how?

thanks!

ok, i'm not sure 'black list' right term. in fact, i'm pretty it's wrong term, have heard if commit crime in foreign country , leave country (or along lines) may not allowed in. query sort of similar: so, a...

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