1. The book of law should have a fixed number of words, written in stone in the constitution. Side effects:

    a) you want to pass a new law? Pick one in the book to get rid of.

    b) magically, the enforcement budget and the size of the fat leech that feeds off of it (the government) remains constant. See "The Advantage of a Dragon" by Stanislaw Lem [1]

2. A law should always (with the possible exception of those in the constitution) have an expiration date, voted with the law, with a maximum of 10 years, at which time the law should get re-voted on if it turns out it was actually useful to society.

[1] http://www.loper-os.org/?p=3725