Demerit points are penalty points given for traffic offenses that accumulate on a driver's record. The number of demerit points a person has depends on their driving record and specific offenses committed. People start with zero points, and points are added for each traffic violation. The exact demerit points limit and consequences vary by jurisdiction, license type, and whether the driver is a professional or provisional driver. For example, in New South Wales, Australia:

• Unrestricted licence holders have a limit of 13 points,
• Professional drivers have 14 points,
• Provisional P2 licence holders have 7 points,
• Provisional P1 and learner licence holders have a limit of 4 points.

If a driver reaches the limit, their license can be suspended, or renewal can be refused, with the option to apply for a good behavior period in some cases. Demerit points remain active for a set period (e.g., 3 years and 4 months in NSW) before expiring if no further offenses occur. Different regions have different thresholds for suspensions and durations for which points stay on the record. Specific examples include South Australia where the threshold for disqualification is 12 points in 3 years, or South Africa where the threshold is 15 points with varying suspension consequences.

To know how many demerit points someone has, they usually need to check their driving record with the relevant government authority, often online or in person with proper identification. If the question was about how many points a specific person currently has, that information can only be obtained through authorized channels based on their license records.