Criminal Law Essentials — CLAT Legal Reasoning
The whole of criminal liability sits on one Latin maxim: actus non facit reum nisi mens sit rea — "an act does not make a person guilty unless the mind is also guilty." CLAT criminal-law questions almost always test whether both the guilty act and the guilty mind are present, or whether a defence removes the guilty mind. Hold that frame and the section is systematic.
1. The two pillars of a crime
A crime generally requires two elements together:
- Actus reus — the wrongful act or omission forbidden by law (the physical element).
- Mens rea — the mental state: intention, knowledge, or recklessness (the mental element).
Neither alone is enough. A guilty thought with no act is not a crime; an act done without a guilty mind (a pure accident) is generally not a crime. This is what most CLAT criminal passages test.
Exception — strict liability offences: for certain regulatory offences (selling adulterated food, some traffic and environmental offences), the law imposes liability without proof of mens rea. If the passage says so, apply it — the guilty act alone suffices.
2. The four stages of a crime
A crime typically passes through four stages; liability usually begins at the third:
- Intention — the mental resolve. Not punishable by itself (thoughts are free).
- Preparation — arranging the means. Generally not punishable (with exceptions, e.g., preparation to wage war, or to commit dacoity).
- Attempt — a direct movement towards commission after preparation. Punishable.
- Commission — the completed offence. Punishable.
The attempt line: the moment an act moves beyond preparation and towards actually committing the crime, it becomes a punishable attempt — even if the crime finally fails (e.g., firing at someone and missing).
3. Some offences against the person and property
- Culpable homicide vs murder — culpable homicide is causing death with the intention or knowledge that death is likely; murder is the graver form, where the intention/knowledge makes death the near-certain or intended result. All murder is culpable homicide, but not all culpable homicide is murder.
- Theft — dishonestly taking movable property out of another's possession without consent (every word is an element to be matched).
- Robbery — theft or extortion aggravated by force or the threat of force.
- Extortion — dishonestly inducing a person, by putting them in fear, to deliver property.
- Cheating — deceiving a person AND thereby dishonestly inducing them to deliver property or do something they otherwise would not.
Each is a checklist: match every element to the facts, and if one is missing the offence is not made out (or a lesser offence is).
4. General exceptions (defences)
Even where the act is done, these defences remove criminal liability — usually by negating mens rea or justifying the act:
| Defence | Core idea |
|---|---|
| Mistake of fact | Acting under a genuine, reasonable belief in facts that would make the act lawful — a defence. Mistake of law is not. |
| Accident | A lawful act done lawfully, with proper care, causing harm by pure accident — no liability. |
| Infancy (doli incapax) | A very young child cannot form criminal intent; below a set age there is no liability, and a slightly older child only if maturity is shown. |
| Unsoundness of mind (insanity) | If, by reason of mental illness, the person could not know the nature of the act or that it was wrong. |
| Intoxication | Involuntary intoxication may excuse; voluntary intoxication generally does not. |
| Private defence | Reasonable and proportionate force to protect person or property. |
| Necessity | Harm done in good faith to prevent greater harm. |
| Consent | Consent of the victim may make certain acts non-criminal (within limits). |
The reliable rule: mistake of fact can be a defence; mistake of law is not ("ignorance of the law is no excuse"). This exact contrast is tested repeatedly.
5. Private defence — the proportionality trap
The right of private defence is real but bounded:
- It must be against an imminent threat — you cannot claim it after the danger has passed (that becomes retaliation).
- The force used must be proportionate to the threat — you may not shoot someone for a shove.
- It extends to defence of body and property, and of others, within reasonable limits.
Options that let a defender use grossly excessive force, or act after the threat ended, are testing these two limits.
6. Common intention and abetment
- Common intention — where several people act together with a shared plan, each may be liable for the whole act as if done alone. The key is a prior meeting of minds.
- Abetment — instigating, aiding, or conspiring in an offence makes the abettor liable, even if he did not perform the final act himself.
7. Exam protocol
- Check for both actus reus and mens rea — unless the passage creates a strict-liability offence.
- Identify the stage: intention/preparation (usually not punishable) vs attempt/commission (punishable).
- For a named offence, run its element checklist; a missing element means a lesser offence or none.
- On mistakes, apply the fact-yes / law-no rule.
- For private defence, test imminence and proportionality.
- Read the passage's definition exactly — CLAT frequently gives a modified definition, and the modified one governs.
