COMMUTER SMT MADE A TKOF FROM MSP WITH THE PITOT AND STATIC PORTS COVERED WITH TAPE.

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I WENT ON DUTY AT XA00 AND OBSERVED MY COPLT DOING THE EXTERIOR PREFLT OF THE ACFT. I PERFORMED THE INTERIOR PREFLT. WE TAXIED TO THE RWY (29R) AND WERE CLRED FOR TKOF WITH MENTION OF TFC ON SHORT FINAL BEHIND US. DURING TKOF ROLL; COPLT CALLED OUT AIRSPD AND ALSO SAID THAT AIRSPD WAS FLUCTUATING. I LOOKED AT MY INDICATOR WHICH READ ZERO AND AT R SIDE WHICH WAS FLUCTUATING BUT READABLE. VR WAS CALLED AND I ROTATED AND IMMEDIATELY TURNED ON PITOT HEAT AS IT WAS COOL AND WET FROM PREVIOUS RAIN SHOWER. APPROX 5 SECONDS LATER THE COPLT'S AIRSPD WENT DEAD AND I SAW THAT THE VERT SPD INDICATOR AND ALTIMETER WERE NOT WORKING EITHER. I TOLD MY COPLT TO INFORM ATC THAT OUR ALTIMETERS WERE NOT FUNCTIONING AND THAT WE WOULD RETURN TO ARPT. AFTER AN UNEVENTFUL LNDG IT WAS DISCOVERED THAT THE STATIC PORTS AND PITOT TUBES WERE TAPED OVER WITH DUCT TAPE. SOMEHOW THE COPLT HAD MISSED THIS ON THE PREFLT. I SELECTED ALTERNATE STATIC AIR AS SOON AS WE INFORMED ATC THAT WE WERE RETURNING. I HAD CONTINUED WITH THE TKOF BECAUSE I THOUGHT THAT PITOT HEAT WOULD SOLVE THE PROBLEM. ALSO; THE TFC LNDG BEHIND US; GOOD VFR WX AND NORMAL ACCELERATION CONTRIBUTED TO MY DECISION TO CONTINUE. SUPPLEMENTAL INFO FROM ACN 190502: I PROCEEDED TO CHK THE ACFT WHICH WAS PARKED ON THE DIMLY LIT RAMP. I OBSERVED THE CAPT'S (L HAND) AIRSPD INDICATOR AT 0 AND INFORMED HIM OF IT. THIS SITUATION WOULD NOT HAVE OCCURRED IF I HAD CHKED CLOSER ON THE PREFLT OR IF A RED OR ORANGE TAPE WAS USED TO COVER THE PITOT AND STATIC PORTS. I ALSO FEEL THAT THE CAPT COULD HAVE ABORTED THE TKOF WHEN IMPROPER AIRSPD INDICATIONS WERE OBSERVED.