Legal Question in Business Law in California

Employers are never required to "write up" an employee before terminating them in California. Employment in California is "at will" meaning that an employee may quit at any time with or without notice and an employer may terminate an employee at any time with or without notice, with or without cause. The only requirement is that an employee must be paid their wages for all the work they have done at the time of termination (or within 72 hours if the employee quits). Individual employers may choose to set their own rules about giving notice or warnings, which are typically disclosed in an employee handbook when the employee is hired. Most employers these days don't specify a cause for termination because that may expose them to a claim of "wrongful termination" if the cause proves false.