1.   Colombian heroin is turning up in San Antonio and South Texas, Parker said.

2.   Over the last three years, he said, the amount of Colombian heroin seized by U.S. agents has doubled every year.

3.   Some law enforcement officials believe that the Cali cocaine syndicate is behind the influx of Colombian heroin.

4.   The flow of Colombian heroin also is increasingly routed through Nigeria, drug agents said.

5.   Their market growth, however, worries officials because Colombian heroin is not only cheaper, but also purer, than the old Southeast Asian variety.

6.   Colombian heroin is mostly found along the Atlantic Coast and, more recently, the Midwest.

7.   It is stage one in the making of high-purity Colombian heroin that has grabbed a big chunk of the market.

8.   Many blame the spread on the fact that Colombian heroin is so pure that it can be smoked or snorted.

9.   Some Colombian heroin is also reaching Europe.

10.   Though cocaine remains much more popular than heroin, the rise in Colombian heroin over the past decade has been worrisome.