§ 4021 Controlled Substance Definition

• •A 'controlled substance' is a drug or chemical that the law says is dangerous or can be misused.
• •The list of these substances is found in a specific part of the Health and Safety Code.
• •This law helps decide what drugs are illegal or restricted.

If someone is caught with a drug like heroin.

Heroin is on the list of controlled substances, so having it without permission is against the law.