S80 CAPT RPT REGARDING THE LAHSO OPS AT DFW WITH TAILWIND EXISTING. WHEN HE SPOKE TO THE TWR ABOUT THE OP; THEY STOPPED IT.

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ATC FACILITY: DFW TWR. LOCATION: DFW W RWY COMPLEX. WHILE AWAITING DEP FOR SLC; I WITNESSED DFW TWR ISSUE LAHSO CLRNCS TO A NUMBER OF ACFT LNDG RWY 18R WITH A HOLD SHORT OF TXWY B CLRNC. SURFACE WINDS AT THE TIME WERE RPTED AS 350 DEGS AT 6 KTS AND THE WIND SOCK ADJACENT TO RWY 18L WAS VERIFYING THE N WIND. I REQUESTED THE WIND AND IT WAS AGAIN RPTED AS 010 DEGS AT 6 KTS. I INFORMED THE TWR VIA RADIO THAT THE LAHSO WAS NOT PERMITTED UNDER OUR MANUAL AND THEY DID STOP ISSUING THAT CLRNC. THE FOLLOWING DAY; I RETURNED TO DFW FROM ORD AND HEARD THE ATIS BROADCAST ATIS INFO; XA53Z; WIND RPTED AT 350 DEGS AT 8 KTS LNDG TO THE S; LAHSO IN EFFECT; PLAN TO HOLD SHORT OF TXWY B; 8450 FT AVAILABLE ON RWY 17C. WE WERE THE NEXT TO LAST TO LAND TO THE S. AS WE CONTACTED DFW TWR; THEY DID NOT ISSUE THE ACTUAL LAHSO CLRNC. OUR CREWS ARE LED TO BELIEVE THIS IS OK; EVEN THOUGH PART 1 SPECIFICALLY PROHIBITS A TAILWIND LAHSO. WE NEED TO HAVE THIS STOPPED BY TWRS ACROSS THE UNITED STATES AND REMIND OUR CREWS OF THE RULES.