toxicologt didn t approve this equipment. until september. peter nickels,he attorney general for the district says the dwi cases for the last six months will be reviewed. some charges may be dropped. some may be reduced. he promised to be fair and accurate. d.c. police say their machines are accurate. it s the procedure that was the problem. there is absolutely no issues with the integrity, the reliability, the accuracy of the instruments. reporter: so the problem here is? it s protocs and procedures. reporter: some history. from march 200until march 2010, police had calibration problems with the intoxilizer. that s the equipment they used back then in dwi arrests. as a result of that problem, 300 dwi convictions are now under question. calibration problems last year, procedural problems this year. the dispute over dwi arrests in the city could go on and on for some time. jim, back to you. pat collins. thank you, pat. well, the entireast coast is still cleaning up