Should Parents spy on their kids?

I think that parents should spy on their kids. If they don't then they won't know what their kids are doing. Some kids don't are very bad. They don't listen to their parents and they think they don't need parents. I have friends who hates their parents and doesn't even want to go home by the thought of their parents being home.
I have mean thoughts about my parents to because of spying and everything. I hate them sometimes when they get on my frickin nerves but then again I still love them. If parents don't ever spy on their kids then who knows how the childrens would be now. Kids like to do bad things. It is what they think is fun. Only a little percentage of kids like to be good or be on their parents good side that I know of.
What if a kid was doing drugs right in his room and his parents didn't check up on him. Kids could be losing their virginity in their room and their parents wouldn't know because they are not spying on them. That is very bad. I think parents should spy on their kids like when someone they don't trust is over.Kids don't like their parents spying on them because of privacy invasion but then on the other hand if you really think about it, it is a good thing. I think that each parent should at least spy on their kids like once in a while. I don't agree with the whole 24/7 spying but like once in a while, that is good. My parents don't invade my privacy all the time. There are times when I think they are but really they have a good caru