TERRORISTS SNEAKING IN, BACK TO YOU. PAT: ALL RIGHT. THANK YOU DAVE. MOST PEOPLE HAVE TO PUT IN 8 HOURS OF WORK TO GET 8 HOURS OF PAY. RICK: NOT SO WITH SOME CITY OF L.A. WORKERS WE CAUGHT WITH OUR HIDDEN CAMERA, DAVID GOLDSTEIN WITH THE STORY. REPORTER: YOU KNOW SOURCES SAY IT HAS BEEN GOING ON FOR YEARS, FOR SOME. NOW MOST PEOPLE HAVE CLOCK IN, DON'T GET PAID UNLESS THEY PUT IN A FULL DAY A WORK, BUT NOT FOR SOME CITY OF L.A. EMPLOYEES WE CAUGHT COMING TO WORK THEN GOING HOME. DAY AFTER DAY, HE WATCHED THIS CITY OF L.A. EMPLOYEE ARRIVE AT WORK. THERE IS ADAM. REPORTER: THEN JUST LEAVE FOR HOME WITHIN TWO HOURS. AM I REQUIRED TO TALK TO YOU. REPORTER: AND OTHERS AS WELL. YOU COME IN AT 6:30 AND LOAF AT LEAVE AT 8:00. IS THIS AN AMBUSH. REPORTER: THEY WORK OUT OF CITY FOLLOWED, FULL TIME. EMPLOYEES PART OF A DRILLING CLUE THEY GET SOIL SAMPLES FOR CITY MAINTAINS WORK ON BRIDGES AND ROADS, PAUL ADAMS, MAKES MORE THAN $100,000 OF TAXPAYER MONEY IN 2016, WE WATCHED HIM COME TO WORK 6:30 IN MORNING, LEAVE 8:15. CROSSING STREET FOR LUNCH. WE WATCHED HE PICKED UP LUNCH. THEN WENT LOOKING AT CAR PARTS THEN WENT HOME. ALL WHILE EARNING YOUR TAXPAYER MONEY THAT IS BECAUSE HIS OFFICIAL CITY TIME SHEET SHOWS HE WORKED FOR 9 HOURS, WE SAW HIM AT WORK ONLY AN HOUR AND 45 MINUTES. ADAMS HERE IN TRUCK JUST LEFT THE YARD. REPORTER: A COUPLE WEEKS LATER, WE SAW HIM LEAVE AT 8:00 A.M., HE WENT CHRISTMAS TREE SHOPPING AT HOME DEPOT WITH HIS KIDS COULD TOOK THEM TO LUNCH, THEN WITHIN HOME, YOU PAID FOR IT HIS CITY TIME SHEET THAT DAY SHOWS 8 HOURS WORK. ADAMS GOING TO HIS TRUCK,. WE SAW IT AGAINST WITH ADAMS, AND WITH THIS MAN HOWARD. HERE HE COMINGS. A MATERIAL TESTING TECHNICIAN FOR CITY MADE $90,000 IN TAXPAYER MONEY IN 2016. ON FRIDAY WE SAW HIM COME TO WORK AT 7:15. AND LEAVE ABOUT AN HOUR AND A HALF LATER. THERE IS THE VEHICLE IN THE DRIVEWAY. REPORTER: BY 930 HE WAS THE HOME IN SYLMAR. BUT HIS TIME SHEET SHOWS 8 HOURS WORK, WE SAW HIM JUST ONE HOUR AND 30 MINUTES. VEHICLE RIGHT THERE. ANOTHER TIME HE LEFT OFFICE AFTER AN HOUR AND 6 MINUTES WE FOLLOWED HIM TO POST OFFICE, HIS HOUSE, MEDICAL FACILITY THEN SOMEWHERE ELSE THEN HOME, BUT TAX PAYERS MADE HIM FOR 9 HOURS OF WORK, WE SAW HIM THERE ONLY ONE HOUR AND 6 MINUTES. MR. ROTH, DAVID GOLDSTEIN WITH "CBS2 NEWS." HOW ARE YOU. GOOD. GOOD. REPORTER: AFTER THE PLEASANT LEAHY DID NOT -- HE DID NOT HAVE A LOT TO SAY. CAN YOU TELL ME WHY YOU SHOW UP FOR WORK AND LEAVE FOR AN HOUR. I DON'T HAVE ANSWER. REPORTER: HE DENIED PUTTING IN FOR A FULL DAY'S PAY. REMEMBER HIS TIME SHEET. I AM DAVID GOLDSTEIN WITH "CBS2 NEWS." ADAMS CLAIMS HE IS ALLOWED TO LEAAFTER A FEW HOURS EVEN THOUGH HE COLLECTS A FULL'S DAY PAY. I WAS RELEASED SUPERINTENDENT LET ME GO. WE HAVE WATCHED YOU, THEY LET YOU GO EVERY DAY? YOU HAVE TO TALK TO HIM. I AM DAVID GOLDSTEIN WITH "CBS2 NEWS." THE SUPERINTENDENT ARE NOT TALKING EITHER. IS THAT NORMAL? NO COMMENT, SIR, YOU CAN TALK TO OUR GENERAL MANAGER. I AM TALKING TO YOU, YOU ARE THE SUPERVISOR DO YOU NORMALLY RELEASE CITY EMPLOYEES AFTER A HOURS OF WORK. NO COMMENT. REPORTER: AFTER WE KEPT QUESTIONING ADAMS HE CHANGED HIS TUNE. TAKING VACATION TIME. WHY DO YOU GO IN MORNING. HALF DAY. HALF DAY. HAPPY NEW YEAR. REPORTER: AFTER THEY FOUND OUT WHAT DAYS WE WERE WATCHING IN FOR A FEW HOURS OF VACATION TIME ON SOME OF THOSE DAYS, WE WANT TO ANSWER CITY OFFICIALS THEY REFUSED TO COME, THEY SAY