Earlier quoted context omitted.
Who knows how many outdated regulations are still on the books? It seems the thing to do would be hire interns to start scouring for every "A married woman shall not chop down a birchwood tree on the day of her wedding while wearing her bridal gown" style law. If this idea persisted for 50 years maybe they'd have to start repealing actual relevant regulations.
I'd actually be surprised if there were many of those. Regulations are constantly being codified into the Code of Federal Regulations. It's about 175,000 pages. It's printed at about 55 lines per page, which makes it about 10 million lines. About the same size as the Linux kernel. That's big, but it's not "we don't even know what's in here" big.
There are entire books written filled with silly, outdated, or absurd laws and regulations (both federal and state).
Here's just a taste[1]:
> 18 USC §1382 & 32 CFR §636.28(g)(iv) make it a federal crime to ride a moped into Fort Stewart without wearing long trousers.
> 16 USC §551 & 36 CFR §261.16(c) make it a crime to wash a fish at a faucet if it's not a fish-washing faucet, in a national forest.
> 21 USC §461 & 9 CFR §381.171(d) make it a crime to sell "Turkey Ham" as "Ham Turkey" or with the words "Turkey" and "Ham" in different fonts
> 18 USC §1865 & 36 CFR §7.96(b)(3) make it a federal crime to harass a golfer in any national park in Washington, DC.
[1] http://www.freedomworks.org/content/19-ridiculous-federal-cr...