Thanks, and thx for the link! Just got back in and will take a look, at least until my eyes glaze over. (The things you learn researching cases, sometimes... I'm not a natural in the sciences, but specific questions will get me reading up on things I'd never normally be interested in.)
Agree with Inthedetails--it'd be my first guess that LE were looking for something related to the case that may have been purposely dropped down into the sewer (this is a sewer near the culvert where she was found). Possibly even looking for a murder weapon if they're headed that direction, theory-wise. (A knife or other puncture-type weapon?)
While I've heard of kids going down storm sewers over the years, these ones on Spring Valley and Bowser look like they have openings too narrow to allow the head of a child to pass through. JMO, though; I may be mistaken.
Thx, osu...whose Twitter account did this photo come from, please? (TIA)