Actus Reus

Actus Reus

Actus Reus

The element requires a voluntary act or a failure to act where a legal duty existed. It pairs with mens rea to establish criminal liability, and both must generally coincide.

Omission liability requires a recognized duty.

Alternative Names:

Guilty Act|Criminal Act

Why it Matters?

Omission liability requiring a legal duty parallels the civil negligence requirement that a duty precede any failure to act, which is why both analyses begin with whether a relationship or statute imposed the obligation. In regulatory enforcement contexts the concept clarifies that failure to comply requires an affirmative obligation rather than merely an outcome the regulator disfavors.

Frequently Confused with

Related terms

Frequently asked questions

When does omission create liability?

When does omission create liability?

Only where a legal duty to act existed, which parallels the civil requirement that duty precede any failure to act.

Must the act and mental state coincide?

Must the act and mental state coincide?

Generally yes, both elements must exist concurrently to establish criminal liability.