The WCA Regulations contain the full set of Regulations that apply to all official competitions sanctioned by the World Cube Association.
The WCA Regulations are also supplemented by the WCA Guidelines. The Regulations should be considered a complete document, but the Guidelines contain additional clarifications and explanations.

https://www.worldcubeassociation.org/regulations/#article-A-speedsolving

Judging Criteria:

Every participant will be supervised by an individual judge. Each participant will get an inspection time of 15 seconds prior to starting the solve, which will be intimated by the judge during the event. The judge’s decision is final.