-- Database schema
| Community_Area : community_area_no [ INTEGER ] primary_key , community_area_name [ TEXT ] , side [ TEXT ] , population [ TEXT ] | District : district_no [ INTEGER ] primary_key , district_name [ TEXT ] , address [ TEXT ] , zip_code [ INTEGER ] , commander [ TEXT ] , email [ TEXT ] , phone [ TEXT ] , fax [ TEXT ] , tty [ TEXT ] , twitter [ TEXT ] | FBI_Code : fbi_code_no [ TEXT ] primary_key , title [ TEXT ] , description [ TEXT ] , crime_against [ TEXT ] | IUCR : iucr_no [ TEXT ] primary_key , primary_description [ TEXT ] , secondary_description [ TEXT ] , index_code [ TEXT ] | Neighborhood : neighborhood_name [ TEXT ] primary_key , community_area_no [ INTEGER ] Neighborhood.community_area_no = Community_Area.community_area_no | Ward : ward_no [ INTEGER ] primary_key , alderman_first_name [ TEXT ] , alderman_last_name [ TEXT ] , alderman_name_suffix [ TEXT ] , ward_office_address [ TEXT ] , ward_office_zip [ TEXT ] , ward_email [ TEXT ] , ward_office_phone [ TEXT ] , ward_office_fax [ TEXT ] , city_hall_office_room [ INTEGER ] , city_hall_office_phone [ TEXT ] , city_hall_office_fax [ TEXT ] , Population [ INTEGER ] | Crime : report_no [ INTEGER ] primary_key , case_number [ TEXT ] , date [ TEXT ] , block [ TEXT ] , iucr_no [ TEXT ] Crime.iucr_no = IUCR.iucr_no , location_description [ TEXT ] , arrest [ TEXT ] , domestic [ TEXT ] , beat [ INTEGER ] , district_no [ INTEGER ] Crime.district_no = District.district_no , ward_no [ INTEGER ] Crime.ward_no = Ward.ward_no , community_area_no [ INTEGER ] Crime.community_area_no = Community_Area.community_area_no , fbi_code_no [ TEXT ] Crime.fbi_code_no = FBI_Code.fbi_code_no , latitude [ TEXT ] , longitude [ TEXT ] |
-- -- Who is the commanding officer in the district with the highest number of reported crimes where no arrest has been made?

SELECT T2.commander FROM Crime AS T1 INNER JOIN District AS T2 ON T1.district_no = T2.district_no WHERE T1.arrest = 'FALSE' GROUP BY T2.commander ORDER BY COUNT(T1.report_no) DESC LIMIT 1;