It doesn’t extend to police questioning, i also pointed out it’s a different thing when you are in a court.
For the police an innocent bystander can turn into a suspect real fast.
The English common law tradition has a crime called “misprision”. Misprision of treason is the felony of knowing someone has committed or is about to commit treason but failing to report it to the authorities.
It still exists in many jurisdictions, including the UK, the US (it is a federal crime under 18 U.S. Code § 2382, and also a state crime in most states), Australia, Canada, New Zealand and Ireland.
Related was the crime “misprision of felony”, which was failure to report a felony (historically treason was not classed as a felony, rather a separate more serious category of crime). Most common law jurisdictions have abolished it, in large part due to the abolition of the felony-misdemeanour distinction. However, in the US (which retains that distinction), it is a federal crime (18 U.S. Code § 4). However, apparently case law has narrowed that offence to require active concealment rather than merely passive failure to report (which was its original historical meaning)
Many of the jurisdictions which have abolished misprision of felony still have laws making it a crime not to report certain categories of crime, such as terrorism or child sexual abuse
