Can the Courts Strike Down a Law?

The books don't change unless congress or some compiler decides to go change them. So think you can still find, like the against flag burning that was held unconstitutional 30 years ago. I think it's still literally on the books. And federal lawsuit a so courts do say a law is unconstitutional if they've given given occasion to ask,. They have to get a case where they'r asked about it, they don't ever take it off the books.