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Constructive termination is a legal term, but it doesn't really have application here.
Constructive termination is when an employer, through their actions, makes working in a location so unbearable that the employee essentially has no other choice but to quit. It is applicable in two situations
1. If an employee has a contract of employment stating that they can only be terminated for cause. The employer can't terminate the employee without cause, because the contract says that they can't, so they make work so horrible that the employee quits. Well, courts would consider that a constructive discharge
2. For purposes of unemployment
, if an employee resigns they are generally disqualified from unemployment. The employer doesn't want to terminate the employee and allow them unemployment, so they make the workplace so unbearable that the employee resigns. Unemployment would consider that a constructive discharge and allow the employee unemployment benefits
Your situation doesn't invoke constructive discharge. It is not illegal in employment law for an employer to have a standard, walk through the motions PIP program unless that employer has a contract with the employee specifically stating that the employee can only be terminated for cause.