1.   Because no agency tracks accidents involving motorized skateboards, physicians and police have only anecdotal evidence of an increase in injury-causing accidents.

2.   Barbara Reynolds, a spokeswoman for the CDC, said that the agency did not track hepatitis C infections in connection with endoscopic exams.

3.   A spokesman for the Internal Revenue Service said the agency had not tracked the number of taxpayers who received the credit.

4.   Credit agencies often track consumer financial records for seven years and note each credit application.

5.   Ellen Vargyas, a lawyer for the EEOC, said her agency did not track how many discrimination cases involved foreign companies.

6.   Most law enforcement agencies do not track cell phone use in accidents.

7.   Over the last year, officials said, the agency has tracked a network that smuggled Canadian-manufactured pseudoephedrine into the country, largely through Detroit and Chicago.

8.   Relief agencies tracked the families to their new addresses, and prisoners like Rizvic were reunited with their families in houses that had never been their homes.

9.   Several agencies have tracked the progress of male and female PhDs in the sciences and the humanities and looked at how they fare on the professorial track.

10.   The agency tracks only incidents that pose a direct threat to flight safety, said spokesman Hank Price.