No, it is not common for narcissists to secretly poison their spouse or install hidden surveillance devices in their house. These behaviors are extreme and illegal actions that go beyond the typical traits associated with Narcissistic Personality Disorder (NPD) or narcissistic individuals.
Narcissistic Personality Disorder is characterized by a pattern of grandiosity, a need for admiration, and a lack of empathy. While individuals with NPD can be manipulative and engage in harmful behaviors, poisoning someone or using hidden surveillance devices are criminal acts that are not representative of NPD as a whole.
It's important to remember that NPD exists on a spectrum, and not all individuals with narcissistic traits will engage in harmful or illegal actions. However, dealing with a person who has NPD can be challenging due to their self-centeredness, lack of empathy, and manipulation, which can lead to toxic relationships.
If you suspect that someone is being poisoned or that hidden surveillance devices have been installed in your house, it is crucial to take these concerns seriously and seek help immediately. Contact law enforcement and consult with legal professionals to address the situation and protect yourself and others involved.