Audio recordings of radio calls between Chicago police and a dispatcher show that at least one officer had requested a Taser before the fatal police shooting of a black teenager.
Seventeen-year-old Laquan McDonald was shot 16 times by one of several officers responding to a complaint about car break-ins in October 2014.
The release of police dashcam video last month showing the shooting has set off weeks of protests.
McDonald was carrying a knife, but appeared to be walking away from officers.
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