ACR A319 DEPARTED LAX RWY 24 COMPLEX WITH A L TURN OUT HAS A NEAR CONFLICT WITH A DEPARTING ACR OFF THE RWY 25 COMPLEX THAT TWR RELEASED WITHOUT ENSURING MINIMUM SEPARATION.

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I HAD JUST RELIEVED THE MANHATTAN DEP SECTOR AT SOCAL TRACON. WORKING ALONE; NO ASSISTANT. I ACKNOWLEDGED AN AUTOMATED RUNDOWN ON A319 AS A CROSSOVER; DEPARTING RWY 24 COMPLEX AT LAX; CROSSOVER TO US AT SCT AND LAX TWR MEANS EVERYONE IS AWARE THAT THE ACFT WILL BE TURNED TO CROSS THE RWY 25 COMPLEX. I ISSUED RADAR CONTACT TO A319 AND CLB CLRNC TO 13000 FT; AND ADVISED THEM NOT TO EXCEED 250 KTS. (STANDARD CLRNC WITH LITTLE TO NO TFC). LAX TWR HAD ENTERED ADDITIONAL ACFT IN MY RUNDOWN LIST. I VECTORED A319 L HDG 190 DEGS; THEN BEGAN PULLING STRIPS CONTAINING DATA ON THE NEWLY RUNDOWN TFC. I ONLY HAD MY EYES AWAY FROM THE SCOPE FOR MERE SECONDS; WHEN I LOOKED UP; I SAW MD82 HAD DEPARTED THE S (RWY 25) COMPLEX; AND WAS ON A 250 DEG HDG; AIMING DIRECTLY AT A319. MD82 HAD 'LEAP FROGGED' MY A319 FLT AND WAS 600 FT ABOVE HIM. THE SHIFT SUPVR WAS AT THE SUPVRS RADAR SCOPE WATCHING; SO I ASKED HIM IF HE WITNESSED THE SITUATION. HE HAD JUST ARRIVED ALSO; BUT HE IMMEDIATELY CAME DOWN TO MY SECTOR; AND I EXPLAINED TO HIM WHAT HAD HAPPENED. AT THE TIME; THERE WAS NO CHANCE OF EVASIVE ACTION; BECAUSE I HAD NO KNOWLEDGE OF MD82 DEPARTING THE RWY 25 COMPLEX; MD82 WAS BEING WORKED BY MY PEER AT THE ADJACENT SECTOR MALIBU. THIS AND OTHER SIMILAR SITUATIONS HAVE BEEN OCCURRING OVER THE LAST 3-4 MONTHS. LAX TWR IS FULLY AWARE THAT AS A MANHATTAN CTLR; WE HAVE TO TURN THE DEPARTING CROSSOVER TFC ACROSS THE RWY 25 EXTENDED CTRLINE TO VECTOR THEM ON COURSE. ONLY AS RECENTLY AS THE LAST 4 MONTHS HAVE THEY REFUSED TO EITHER WAIT UNTIL THE PROCEEDING ACFT (CROSSOVER); HAS PASSED THE RWY 25 DEP END; THEN LAUNCH THEIR RWY 25 DEP. LAX TWR ALSO HAS ANOTHER OPTION; THEY CAN RUN DOWN THE RWY 24 DEP AS A 210 DEG HDG; THEN WAIT FOR APPROPRIATE SPACING; AND THEN BEGIN TO LAUNCH TFC FROM THE S COMPLEX (RWY 25'S); BASED ON THE POS OF THE CROSSOVER. MYSELF AND AT LEAST 1 OTHER CTLR IN MY AREA HAVE DOCUMENTED THIS HAZARD SEVERAL TIMES IN THE PAST 4 MONTHS. THE FIRST TIME I ENCOUNTERED THIS 'SIDEWALL' WITH MY CROSSOVER TFC; I HAD NO CHOICE BUT TO TAKE EVASIVE ACTION. IN THAT SITUATION FORTUNATELY I WAS ABLE TO RESTRICT FLT TO 2000 FT AND AVOID IN THE BEST CASE SCENARIO; A NEAR MISS. LAX TWR IS A CERTIFIED LIMITED APCH TWR. RECENTLY IT SEEMS THEIR ATTITUDE IS THAT IF THE TFC HAS DEPARTED THE RWYS; THEY NO LONGER NEED TO SEPARATE. THERE HAVE BEEN SLIGHT IMPROVEMENTS AND CHANGES IN AIRSPACE AND PROCS; LAX TWR IN THE PAST HAS NEVER OPERATED THIS WAY UNTIL RECENTLY. I RPTED THIS INCIDENT TODAY BTWN THE MD82 AND A319 TO MY SUPVR. MY INITIAL ASSESSMENT OF THE SEPARATION WAS APPROX 2.7 MI LATERAL; AND APPROX 600 FT VERT. UPON INVESTIGATION AND OBSERVING DATA REDUCTION; IT WAS DETERMINED THAT THERE WAS 3.1 MI LATERAL SEPARATION. THE 3.1 MI SEPARATION OCCURRED BY SHEER LUCK AND NOT BY CTLR AWARENESS ON THE PART OF LAX TWR. I CONSIDER THE POTENTIAL FOR NMAC/LOSS OF SEPARATION AS VERY HIGH DUE TO THE MISINTERP OF RADAR DEP SEPARATION BY LAX TWR.