PLT OF A SMA SEL IS STOPPED WHILE TAXIING TO PARKING BY THE SHERIFF FOR SUSPECTED DRUG TFCING.

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INST RECURRENCY CHK WITH CFII. DEPARTED KTMB (TAMIAMI) AT XX32 LCL. FILED IFR TO KLNA (PALM BEACH COUNTY AIRPARK). REQUESTED VOR RWY 15 APCH ENRTE. VECTORED FOR APCH. CLRED FOR APCH. CANCELED IFR 3.0 DME FROM MAP. FLEW MDA TO MAP. THEN CLBED RWY HDG FOR CIRCLE TO LAND. COMPLETED PATTERN WITH ALL REQUIRED CALLS (XWIND; DOWNWIND; BASE; FINAL) ON CTAF. INSTRUCTOR SHUT OFF STROBES AND LNDG LIGHT ON APCH BECAUSE ALTERNATOR SWITCHED OFF LINE AND BATTERY WAS DRAINING. UNNECESSARY ELECTRICS SHUT DOWN. ON SHORT FINAL; LNDG LIGHT TURNED ON. TAXIED TO WELL LIGHTED RAMP AT XX30. SAW BLUE FLASHING LIGHTS AT 10 O'CLOCK COMING TOWARD US. TAXIED WITH CAUTION. POLICE CAR STOPPED WITHIN 15 FT OF TXWY. SHINED SPOTLIGHT IN OUR EYES. OFFICER JUMPED OUT AND AIMED REVOLVER AT US. SAID WE DIDN'T STOP WHEN WE SAW LIGHTS. ACCUSED US OF DRUG TFCING; WHILE AT GUN POINT STATED THAT WE TRIED TO SNEAK IN TO ARPT AT NIGHT UNDETECTED. WE EXPLAINED INST MISSION AND CONFIRMED FLT PLAN WITH APCH CTL. HELD US FOR 90 MINS AND CALLED 10 MORE POLICE CARS PLUS HELI AND DOGS. POLICE NEED TO BE INSTRUCTED ABOUT ARPT OPS. VEHICLE NEARLY RAMMED US. OFFICER NEARLY SHOT US BECAUSE WE FLEW OVER LOW (420 FT MDA) AND WITHOUT LIGHTS (NO STROBES OR LNDG LIGHT). NAV LIGHTS AND RED ROTATING BEACON WERE ON AT THE TIME. HE WAS UNAWARE OF STANDARD ACFT LIGHTING REQUIREMENTS.