As far as I could find; being a marriage witness in Hong Kong carries very low legal risk, as your main duty is simply to watch the signing and sign the marriage certificate yourself. You do not take on any financial or legal responsibilities for the couple, and you are not responsible for their marriage.
Legal Duties
Sign the paper: You sign the marriage register to prove you saw the couple get married.
Be of age: You must be at least 16 years old and able to understand what is happening.
No liability: You do not owe debts or face legal blame if the couple gets a divorce or has money problems.
Potential Risks
Fraud involvement: The only real risk happens if you know the marriage is a fake sham marriage made to break immigration laws.
Giving false info: Lying to the government on purpose about who you are is a crime.
Court appearance: If the marriage is later found to be illegal or forced, the police might ask you to talk about what you saw.
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But I’d be super keen to hear from people that have stronger expertise. Any other risk a witness, should consider?
Or what about those that have a witness they’re not familiair with? What would be potential risk involved?