Negligent security cases can be challenging to prosecute. In these kinds of cases, a plaintiff typically will seek to hold a defendant landowner liable for failing to protect him or her from harm intentionally caused by a third party. For example, if a building owner fails to maintain the lock on its front door and an assailant gains entry through it and assaults a tenant, the tenant may argue that the landlord breached a duty of care to those on the premises by failing to provide adequate security. When these cases go to trial, it becomes incumbent on the plaintiff's attorney not only to show that the landowner's negligence proximately caused the assault, but also to minimize the apportionment of damages to the third-party assailant (whose identity may or may not be known) to ensure a meaningful recovery.