Might be legal or illegal depending on where you are. But it's awful that it's even a thing. For example https://en.wikipedia.org/wiki/Article_8_of_the_European

Might be legal or illegal depending on where you are. But it's awful that it's even a thing. For example https://en.wikipedia.org/wiki/Article_8_of_the_European_Convention_on_Human_Rights https://en.wikipedia.org/wiki/Article_8_of_the_European_Conv... says: =========================================== Article 8 – Right to respect for private and family life 1. Everyone has the right to respect for his private and family life, his home and his correspondence. 2. There shall be no interference by a public authority with the exercise of this right except such as is in accordance with the law and is necessary in a democratic society in the interests of national security, public safety or the economic well-being of the country, for the prevention of disorder or crime, for the protection of health or morals, or for the protection of the rights and freedoms of others. ===================== So basically it's illegal until the authorities deem it to be legal.