In prison, prisoners may obtain drugs through the following methods: 1. **Prison guards or staff**: Sometimes corrupt prison staff may be bribed to bring drugs into the prison. 2. **Family members or visitors**: When visiting prisoners, family members or visitors may try to bring drugs into the prison through covert means. 3. **Mail**: Drugs may be hidden in mail, such as books, photos, or other items, in an attempt to pass prison inspections. 4. **Drones**: In some cases, drones have been used to deliver drugs to open areas of prisons. 5. **New prisoners**: Sometimes new prisoners become carriers of drugs, deliberately swallowing or hiding them inside their bodies to bring them into the prison. 6. **Concealed means**: Other innovative methods are used to evade prison security checks, such as hiding in daily necessities. Prison authorities continue to improve security and inspection measures to meet these challenges, but drug smuggling remains a problem that is difficult to completely eradicate.