What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AFTER TAKEOFF, FLIGHT ATTENDANTS CALLED AND SAID THERE WAS A VERY STRONG SMELL IN THE CABIN. CONTINUED TO CLIMB AND LEVEL AT FL260, THE SMELL NEVER WENT AWAY. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT LAS. ACCOMPLISHED J/C 08L00021001. NO FINDINGS AND ODOR NOTED. ACCOMPLISHED ENGINE RUN WITH PACKS RUNNING PER MOC, NO ODORS NOTED, NO FAULT FOUND.