Inside Tucson 911 call center fielding Nancy Guthrie tips

OPERATORS ARE BEING INUNDATED WITH THOUSANDS OF TIPS. THOUSANDS OF TIPS. LIZ KREUTZ IS THERE FOFOR US. LIZ KREUTZ IS THERE FOR US. >> Reporter: TONIGHT, FOR US. >> Reporter: TONIGHT, , THE AGONIZING SEARCH. THE AGONIZING SEARCH FOR NANCY GUTHRIE STRERETCHING INTO ITS. FOR NANCNCY GUTHRIE STRETCHING INTO ITS 19th DAY. STRETCHING INTO ITS 19th DAY. INSIDE THE PIMA COUNTY. 19th DAY. INSIDE THE PIMA COUNTY SHERIFF'S 911. SHERIFF'S 911 COMMUNICATION CENTER, THIS IS WHERE. COMMUNICATION CENTER, THTHIS IS WHERE DISPATCHERS ARE. DS. FIELDING THE THOUSANDS OF TIPS POURING IN. >> WE'VE BEEN. OF TIPS POURING IN. >>>> WE'VE BEEN INUNDATED WITH PHONE. S. CALLS. >> Reporter: WITH MASSIVE PUBLIC. >> Reporter: WITH MASSIVE E PUBLIC INTEREST COMES MASSIVE. INTEREST COMES MASSIVE DISTRACTIOION. THE DEPARTMENT SAYS. THE DEPARTMENT SAYS THE SYSTEM IS GETTING BOGGED DOWN WITH. BOGGED DOWN WITH CALLERS SHARING EVERYTHING F FROM. CALLERS SHARING EVERYTHING FROM THEORIES TO. THEORIES TO PREMONITIONS. >> IF YOU'RE THINKING. PREMONITIONS. >> IF YOU'RE THINKNKING ABOUT CALLING IN A TIP.

>> IF YOU'RE THINKING ABOUT CALLING IN A TIP OR A LEAD D OR IF YOU. ABOUT CALLING IN A TIP OR A LEAD OR IF YOU HAVE SPEPECIFIC. HAVE SPECIFIC INFORMATION REGARDING THE CASE, I ASK THTHAT. INFORMATION REGARDING THE E CASE, I ASK THAT YOU STOP AND TAKE A. IS. YOU STOP AND TAKE A MOMENT AND THINK, IS THIS TIP VIAIABLE? MOMENT AND THINK, IS THISIS TIP VIABLE? IS IT CREDIBLE? THIS TIP VIABLE? IS IT CREDIBLE? WHAT WE DON'T WANT ARE. IS IT CREDIBLE? WHAT WE DON'T WANT ARE THE OPINIONS AND THE. WHAT WE DON'T WANT ARE THE OPINIONS AND THE THOUGHTS AND, KIND OF, THE OPINIONS AND THE THOUGHTS AND, KIND OF, WONDERING IF. WONDERING IF INVESTIGATORS ARE DOING A, B, C, AND D. INVESTIGATORS ARE DOING A, B, C, AND D. >> Reporter: CURURRENTLY. DOING A, B, C, AND D. >> Reporter: C CURRENTLY 400 INVESTIGATORS ARE. , WORKING THE CASE, CANVASSING TUCSON LOOKING FOR CLUES. CANVASSING TUCSON LOOKING FOFOR CLUES. PART OF WHAT MAKES THE. PART OF WHAT MAKES THE SEARCH SO CHALLENGNGING IS JUST HOW VAST THE. IS JUST HOW VAST THE AREA AROUND NANCY'S HOME IS. AREA AROUND NANCY'S HOMEME IS. YOU CAN GET A SENSE OF. YOU CAN GET A SENSE OF IT HERE. PIMA COUNTY IS ABOUT.

IT HERERE. PIMA COUNTY IS ABOUT 9,000 SQUARE MILES. 9,000 SQUARE MILES. IT IS LARGER THAN THE ENTIRE STATE OF NEW. ENTIRE STATE OF NEW JERSEY. AND A LOT T OF IT LOOKS. JERSEY. AND A LOT OF IT LOOKOKS LIKE THIS, MASSIVE. AND A LOT OF IT LOOKS LIKE THIS, MASSIVE MOUNTAIN RANGES AND A. LIKE THIS, MASSIVE MOUNTAIN RANGES AND A DESERTRT THAT STRETCHES. DESERT THAT STRETCHES FOR MILES. >> WHAT DO YOU MAKE OF. FOR MILES. >> WHAT DO YOU MAKE OFOF THIS? >> WHAT DO YOU MAKE OF THIS? >> Reporter: THIS? >> Reporter: BALLISTICS EXPERERT. >> Reporter: BALLISTICS EXPERT JOHN -- - SAYS THE. BALLISTICS EXPERT JOHN -- SAYS THE SUSPECECT'S HOLSTER, JOHN -- SAYS T THE SUSPECT'S HOLSTER, WHICH APPEARS TO BE A. WHICH APPEARS TO BE A UNIVERSAL FIT, INDICATES TO HIMIM THIS. UNIVERSAL FIT, INDICATES TO HIMIM THIS ISN'T SOMEONE FAMILIAR. ISN'T SOMEONE FAMILIAR WITH FIREARMS. >> UNIVERSAL FIT MEAEANS. WITH FIREARMS. >> UNIVERSAL FIT MEANS IT DOESN'T FIT. IT DOESN'T FIT ANYTHING ELSE. THAT HOLSTER IS SO. ANYTHING ELSE. THAT HOLSTER IS SO CHEAP THAT YOU WON'T. THAT HOLSTER IS SO CHEAP THAT YOU WON'T EVENEN FIND THAT IN THE. CHEAP THAT YOU WON'T EVEN FIND THTHAT IN THE BARGAIN BIN AT THE GUN.

EVEN FIND THAT IN THE BARGAIN BIN AT THE GUN STORE. STORE. >> Reporter: AND TOM, THAT UNKNOWN DNA IS. THAT UNKNOWN DNA IS STILL BEING ANALYZED TONIGHT. TONIGHT. NEIGHBORS CONTINUE TO LEAVE MESSAGES OF HOPE.