'Brand police' on the look out for ads near Olympic Park that aren't official sponsors.

Olympic host cities get a huge windfall of tax revenues and tourist dollars, right? Freakonomics looks at the effect the games really have on a host city.

Today, the Greek Athletics Federation laid out what it sees as a "bleak future" for sports. The federation has suspended track and field events as part of budget cutbacks. That puts into question Greece's ability compete in the London Olympics this summer.