Negligent Operator Points

NOTS actions are based on the number of negligent operator "points" drivers
add to their driving record within specified time periods. Negligent operator
points are added to the driving record upon receipt of conviction notices
from courts and reports of responsible collisions from law enforcement which
indicate that the driver contributed, was at fault, or was responsible to any
degree or in any amount for the collision. The initial reporting of the
responsibility for a collision by law enforcement can be refuted by credible
evidence presented by the driver at an administrative hearing. The department
shall consider all evidence submitted in reaching a final determination with
regard to the driver's negligent operator status.

http://www.dmv.ca.gov/dl/driversafety/neg_operator.htm
http://www.dmv.ca.gov/dl/vioptct.htm

How long does a point stay on my license?
The length of time depends on the severity of the offense.

Most points (illegal turn, not making a complete stop, driving over the speed
limit, etc.) and/or accidents will stay on your DMV driver record for 36
months (3 years).

Points for more serious offenses, such as hit-and-run or a DUI, will stay on
your license record for 10 years.