Extracting THC from a marijuana plant can be done using several methods, each varying in complexity and safety. Here are some common techniques:

1. **Solvent Extraction**:
– **Alcohol Extraction**: Use high-proof ethanol to soak the plant material. The ethanol dissolves the THC and other cannabinoids. After straining, the solution is evaporated to leave behind a concentrated extract.
– **Butane Extraction**: This method uses butane as a solvent to extract THC. It requires careful handling due to the flammability of butane. The extracted oil is purged of residual butane under a vacuum.

2. **CO2 Extraction**:
– This method uses supercritical CO2 to extract cannabinoids. CO2 acts as a solvent that can be adjusted to target specific compounds. It’s a more expensive method but yields high-quality extracts without harmful residual solvents.

3. **Oil Infusion**:
– Heat cannabis in a carrier oil (like coconut or olive oil) to infuse the oil with THC. This method is simple and can be done at home, but it results in a less concentrated product.

4. **Dry Ice Extraction**:
– This method uses dry ice to freeze the plant material, making the trichomes brittle. The plant is then shaken or agitated, causing the trichomes to break off and collect as kief, which is high in THC.

5. **Water Extraction (Bubble Hash)**:
– Use ice water and agitation to separate the trichomes from the plant material. The trichomes sink to the bottom and can be collected as hash.

Always remember to adhere to local laws and regulations regarding marijuana extraction and use appropriate safety measures, especially when using solvents.