Is it true that when an investigator is given a mandate to conduct an investigation, they may move outside this scope, provided the offenses are serious enough?

It is not true that an investigator can move outside the scope of their mandate, even if the offenses are serious. Investigators are required to follow the specific instructions and guidelines given to them when conducting an investigation. If they believe that additional offenses are being committed, they must seek approval from their superiors or the appropriate authorities to expand the scope of their investigation. Moving outside the scope of their mandate without proper authorization can compromise the integrity of the investigation and may lead to legal consequences.