DEPARTING VCV; A LAW ENFORCEMENT HELI TAKES EVASIVE ACTION TO AVOID ANOTHER INBOUND LAW ENFORCEMENT HELI.

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AT APPROX XA10; I WAS THE PLT OF ACFT X (MD 600N) ENRTE TO A PURSUIT THAT WAS NBOUND ON THE FREEWAY. I LOOKED DOWN TO MAKE SURE THE GPS WAS ACQUIRING THE SATELLITES AND LOOKED BACK UP TO SEE AN EUROCOPTER AS350 EMERGE FROM MY L FORWARD BLIND SPOT AT NEARLY 200 YARDS AWAY WITH NEARLY 240 KTS CLOSURE RATE (DETERMINED BY COMPARING BOTH SIDES OF THE STORY AFTER LNDG). I WENT INTO AN AGGRESSIVE L EVASION AND CALLED TWR TO TELL THEM 'YOU HAVE A NORDO NBOUND 2 MI S OF THE ARPT; WE JUST HAD AN NMAC; HEADS UP!' I THEN HEARD OTHER HELICOPTER SAY ON TWR FREQ 'WE ALREADY TALKED TO TWR.' WE CONTINUED ON TO THE PURSUIT. WHILE FLYING BACK TO VCV FROM THE PURSUIT; I RAN IT OVER IN MY MIND AND CAME TO THE CONCLUSION THAT TWR HAD NOT NOTIFIED ME OF THE TFC INBOUND FROM THE S. I AM RESPONSIBLE FOR 'SEE AND AVOID' PRACTICES; BUT TWR'S FAILURE TO NOTIFY ME THE OTHER ACFT WAS INBOUND FROM THE S; OR THAT I WAS OUTBOUND TO THE S; SET THE GND WORK FOR A POTENTIALLY LETHAL EVENT. WE WERE NOTIFIED BY OUR VALLEY SHIP THAT A PURSUIT WAS NBOUND ON THE FREEWAY AND ASKED IF WE COULD TAKE IT OVER DUE TO THEIR FUEL STATE. WE REFUELED AND STARTED UP BY ABOUT XA07 HRS. I CALLED VCV TWR AND TOLD HIM I WAS READY TO DEPART SBOUND. TWR GAVE ME THE 'PROCEED AS REQUESTED' TKOF CLRNC. NO MENTION WAS MADE OF ANY ACFT INBOUND FROM THE S. I DEPARTED VIA RWY 21 PARALLEL TXWY AND THEN HEADED SBOUND. I LOOKED DOWN AT THE GPS TO CHK THAT IT WAS NAVING. ABOUT 4 SECONDS PASSED WITH MY EYES INSIDE THE COCKPIT. WHEN I LOOKED UP; I SAW THE AS350 EMERGING FROM MY L DOOR POST BLIND SPOT. I CHOSE A L EVASION. THE AS350 APPEARED TO MAKE NO EVASIVE MOVE. I LEVELED OUT AND TURNED ON COURSE SBOUND. THE AS350 STATED ON TWR FREQ THAT THEY HAD CONTACTED TWR PRIOR TO ENTERING CLASS D AIRSPACE; BUT WE HAD NOT HEARD IT. IT HAD BEEN 3 MINS SINCE WE HAD STARTED THE ENG. AFTER THE PURSUIT TERMINATED; WE FLEW BACK TO VCV AND MET WITH THE AS350 CREW. WE CAME TO THE FOLLOWING CONCLUSIONS: THE VCV CTLR HAD ACKNOWLEDGED AS350'S INITIAL XMISSION APPROX 10 MI S OF VCV. NO MENTION OF THE INBOUND TFC WAS MADE TO ME ON MY DEP CLRNC FROM THE CTLR. THE AS350 HAD US IN SIGHT AND WAS TRYING TO CONTACT US ON THEIR INTERNAL VHF. WE WERE ON ANOTHER FREQ IN PREPARATION FOR COORD WITH THE ACFT WE WERE RELIEVING. THE AS350 MADE NO EVASIVE MANEUVER BECAUSE HE DIDN'T KNOW IF I WAS GOING TO GO R OR L. THIS IS THE SECOND TIME IN 7 DAYS WE HAVE HAD CONFLICT TFC WITH ANOTHER HELICOPTER. SPOKE WITH VCV TWR CHIEF THAT NIGHT ON THIS ISSUE. I BELIEVE MYSELF AND AS350 SHARE AN EQUAL BURDEN OF THE BLAME DUE TO OUR OBLIGATION TO SEE AND AVOID TFC; BUT THE VCV ATC HAS THE MAJORITY OF THE BLAME IN THIS SIT DUE TO HIS APPARENT LACK OF ATTN AND ASSUMPTION THAT I WAS 'JUST JOKING' ABOUT AN NMAC.