The announcement was made shortly after 2 a.m. Thursday.
The other contestants who placed were: Melissa James (3rd runner-up), Crystal Amedee (2nd runner-up), and Talisha Son (1st runner-up).
Duncan, 27, who represented the Beat & Patrol Division of the Royal St. Lucia Police Force, also won best speech. She is from the community of Marchand.
Son won the best dress, best sports wear and best talent categories, while Amedee won best interview.
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According to a profile on Duncan published prior to the show, her interest lies in “reading, positive socialization” and a “passion for addressing and assisting with issues confronting children and affecting children”.
“It is my aim to become a qualified social worker to assist in curbing the many ills affecting the future of tomorrow but not limiting,” she said.
The annual event was held for the fifth year by the Royal St. Lucia Police Force at the National Cultural Centre.
The pageant forms part of activities for Police Week, being observed from Nov. 25 to Dec. 2.
The contestants were:
Cyrstal Amedee – Miss SLASPA
Talisha Son – Miss Crime and Prosecution
Katia Mitchel – Miss Traffic
Danielle Jacob – Miss Immigration
Nersha Duncan – Miss Beat and Patrol
Melissa James – Miss Control Room
Marie Octave – Miss MAC (Marigot, Anse-La-Raye and Canaries Police Stations)
Curline Joseph – Miss Vieux Fort
Tyle St. Catherine – Miss Fire Service