What does the term LUD on law and order mean?

In the context of Law and Order, "LUD" typically stands for "Lawful Unlawful Detainer." It refers to a legal action where a landlord seeks to regain possession of a property from a tenant who has unlawfully remained after the lease has expired or been terminated. This process is often part of eviction proceedings. It's essential for landlords to follow proper legal procedures to ensure their actions are lawful.