<p>A 39-year-old Shreveport police officer resigned Friday, a day after being arrested in Bossier City on a charge of pornography involving juveniles .</p>
<p>Sgt. Alain Pierce of Bossier City, who worked 18 years for Shreveport police, turned in a letter of resignation, Shreveport Police Chief Mike Campbell said. "At this point, he has resigned and won't be back."</p>