And better drugs and medical technology also play a key role.

In these categories, police officials said, drugs played a major role.

Some drugs just don't play well with each other.

It is unclear whether drugs played a role in the incident.

In more than 80 percent of the cases, drugs played a role.

Investigators suspect that drugs may have played a part, officials said.

What role the drugs play in the onset of cancer, if any, is still open to debate.

The police said they did not know whether drugs played a role in the shootings.

But in 1990, drugs played a role in only 25.7 percent.

At the higher level involving call girls and hotels, he said, drugs do not play a role.