LAWRENCE, Kan. (AP) — Lawrence police say they’re still trying to figure out how to enforce a ban on texting while driving, three years after the law went into effect.

Exceptions allow drivers to use a phone’s map application or check emergency alerts, making enforcement even more complicated for police and prosecutors.

Drivers’ phones typically are examined only after accidents causing death or serious injuries to see if texting led to the crashes.

Police Chief Tarik Khatib says it’s tough for a single officer to keep an eye out for texting drivers without putting himself or herself in danger of wrecking.

The Kansas Department of Transportation says the number of accidents caused by drivers distracted by their cellphones rose from 292 in 2005 to 518 in 2010.