How should flies be controlled in restaurants?

I eat out often, and very often have a problem with flies in the dining room. These are not chintzy or fast-food joints, necessarily. Don't restaurants use 'fly-paper' anymore? Are they not allowed to use chemicals for insect control? They seem to just come in with people using the doors.How should flies be controlled in restaurants?
They make a fixture that looks like a wall sconce, but little to the customers know, they are actuall insect traps. They work very well.
No, unfortunately, I don't recall the name of this device, I work next to a subway and they have several. I only know because I asked how the keep the flies away.

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How should flies be controlled in restaurants?
By hanging up Ziploc bags with water in them that the number of flies greatly reduces! Fly-strips don't always do their job so even if restaurants use them sometimes you don't realise it. There are also those lights that restaurants can buy and turn on at night (or when closed) to reduce the number of flies though I don't think that those are as 'animal' friendly
u know, 20 m inutes ago i said the same thing to my boss as i seen a fly on the till screen and he said in his greek accent ''wat do u want me to do about it? chase it? no fly aftr it?'' i wasnt impressed. now im on my break and gonna look it up on yahoo, and go back to him in 45 m inutes with a smart *** ansewr and solution to the problem
They could hire Ralph Macchio, The Karate Kid, to chase them with chopsticks. He's pretty good.