The Federal Court of Malaysia has upheld a lower court's determination that a key prosecution witness in the trial of former minister Syed Saddiq Syed Abdul Rahman may have been subjected to improper pressure.

The decision reinforces the legal foundation for Saddiq's full acquittal, which was previously confirmed by the Federal Court in a 2-1 majority ruling that dismissed the prosecution's appeal.

The latest judgment addresses specific concerns regarding the integrity of the evidence presented against Saddiq, a former Muar Member of Parliament.

By validating the Court of Appeal's finding on witness pressure, the highest court in the land has effectively closed the door on further legal challenges from the prosecution regarding this aspect of the case.

This development marks a significant conclusion to a protracted legal battle that has had broader implications for Malaysia's political landscape.

The case, which involved allegations of abuse of power and other charges, has been closely watched by investors and international observers as a barometer for the rule of law and judicial independence in the country.