For most cases, no, this is a violation of one's personal right to privacy

It reminds me of the way the police will use anything you say against you, which makes staying silent and hiring a lawyer immediate so crucial when defending yourself in the justice system. I believe violating the privacy of the people is a slipper slope to tyranny. People need to be protected and have the freedom to their personal, private lives. They have a right to defend themselves also. The exception would be for extreme cases when it's determined a serious threat exist and this is absolutely necessary to protect the country and people- in which case, a court order should be required and the person involved should already have a criminal history/involvement in a serious crime.