The OP says 70 years: "The Department for Work and Pensions (DWP), despite mounting criticism, stands by this policy, asserting that it has been in place for over 70 years."
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Muhammad
18,156 Most Common Thai Names & Meanings (forebears.io)
18156 Mohammed's in Thailand (lot of Muslims in the south).
Never hit a woman ever? You have no life experience then, there a some nutters around who will have no problem to slap or stab you.
"a previous visit his mother made to a neighbor, whose son is a drug dealer, could have sparked suspicion."
You are not reading between the lines, you are making things up.
Tell him it is great that he is free and ask about the relation and how he feels about staying in the closet so long.
You should discuss this like any other topic. I have a gay brother who came out earlier but had big problems to do so as my father had a hostile attitude to gays (this was decades ago).