The story

With $100 million in federal taxpayer funds, the U.S. Secret Service has transformed the two cities playing host to the national political conventions into high-tech fortresses.

But there are still questions about whether the cities are prepared to handle the tens of thousands of protesters who are expected to flood into each city.

This week's Democratic National Convention in Denver, Colorado, and the Republican convention in Minneapolis-St. Paul, Minnesota, which begins September 1, have been designated "national special security events," which means the Secret Service is responsible for planning and implementing a security scheme for each city. Read full article »

CNN's Joe Johns contributed to this report.

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