Law enforcement, governments, Crime Stoppers programmes, families, employers and community groups, each with different rules and conditions.
They typically require information leading to an arrest, charge or conviction, may exclude certain people and often expire unless renewed.
Yes. Crime Stoppers programmes assign tip numbers and pay rewards without revealing tipsters' identities.
False tips, scams and direct demands for payment; routing rewards through agencies or recognised programmes reduces these risks.
With clear posters, conditions and a tip line, placed where relevant people live and work, plus media and social appeals.