On the cop thing: Several of my good friends are cops, so I suppose I take some offense to blanket statements like that. There are certainly rotten cops out there who make sure that nobody they encounter misses the badge and the power it gives them, but they don't make all cops bad. Statements like "I hate cops" feeds the ego of the rotten cops and makes the good cops wonder why they even bother to do their jobs. Simply state that some are unfit and undeserving to wear the uniform and you'll be truthful without being offensive.
On the wireless, WEP will protect you against wardrivers in most locales. There's no sense to spend a few minutes breaking a WEP when there's going to be an unprotected WiFi network only seconds down the road. My home network is configured that way mostly because I still have a wireless component that won't support WPA, but my LAN has been fairly well secured to help ensure that nothing can really be stolen from me but bandwidth. I don't do MAC filtering because it causes me more headaches than it causes potential theives problems, and without MAC filtering, no theif would bother to mask his own. I check my logs regularly and would block any MACs I didn't recognize. Apparently my theory works, since I've never seen any MACs but my own.
At work, we do sort of what TheGlover said, but without all the waste of buying Cisco. Cisco has done very little lately to make me feel like they provide any real security on their equipment, or that they even care about security beyond saving face for their company, so I see no reason to pay their bloated prices. If you want relatively secure, inexpensive wireless equipment, look to the startups. Our WiFi network is in something very similar to a DMZ and is treated as untrusted when its using any channel but the same VPN traffic that we allow from our Internet connection. There are certainly a hell of a lot more people on the Internet than are on our wireless at any given moment, so we figured the same security practices that have protected us from the Internet for all this time can be applied to our WiFi network as well. So far it's working, according to our IDS. Not only that, but you can't get WiFi signal outside our building for whatever reason, so anyone wanting to steal my bandwidth would have to be seen.