ACR LNDG DEN WAS ADVISED BY ATC OF FOD ON THE RWY AND ELECTED TO GO AROUND; REPORTER QUESTIONS ATC'S CONTINUED USE OF THE SUBJECT RWY.

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CLRED FOR LNDG RWY 26 DEN. ACFT AHEAD RPTED DEBRIS ON THE RWY; RPTED AS A 'PIECE OF METAL 6 INCH WIDE AND 2 FT LONG' IN THE TOUCHDOWN ZONE (1ST 3000 FT) JUST R OF CTRLINE. WE ELECTED TO GO AROUND; TWR THEN ISSUED A LNDG CLRNC TO ACFT BEHIND US; WHICH THEY ACCEPTED. SWITCHED TO DEP CTL; WHO THEN VECTORED US BACK FOR A CLOSE IN APCH BACK TO RWY 26. I ASKED IF THE RWY HAD BEEN INSPECTED; HE SAID IT HAD NOT; AND DID NOT KNOW WHY IT NEEDED TO BE. I TOLD HIM THERE WAS FOD RPTED ON THE RWY; AND REQUESTED RWY 35R; WHERE WE LANDED UNEVENTFULLY. I CALLED DEN TWR SUPVR AFTER LNDG; AND SPOKE WITH SUPVR. I ASKED HIM WHY A LNDG CLRNC WAS OFFERED TO A POTENTIALLY FOD'ED RWY; AND WHY IT CONTINUED TO BE OFFERED TO OTHER AIRPLANES WITHOUT THE RWY BEING INSPECTED. HE REPLIED THAT BASED ON THE LOCATION AND TYPE OF RPT; THEY WOULD KEEP THE RWY OPEN FOR PLTS TO DECIDE ON LNDG WITHOUT INSPECTING IT. I FEEL THIS IS A POTENTIALLY DANGEROUS PROC; ESPECIALLY WHEN THE DEBRIS IS RPTED AS LARGE PIECE OF METAL IN THE TOUCHDOWN ZONE.