Why Aren't We Helping Find The 43 Missing Students ???

Here's the latest news from the hunt for Mexico's missing 43 students:

Laboratory tests showed no evidence that Mexico’s missing 43 students were among the remains recovered from a rubbish tip, where the Mexican government insists the teacher trainees’ bodies were burned in an all-night inferno and the ashes tossed in an adjacent river.

The results, released to reporters late Friday night, dealt further discredit to the official investigation, which the attorney general at the time called “the historic truth”. The report comes as the Mexican government defended its original inquiry from accusations that it undermined the work of international investigators, who considered the fire theory implausible and scientifically impossible.

You can read the rest @
http://www.theguardian.com/world/2016/apr/09/mexico-ayotzinapa-43-missing-students-no-evidence

I seem to recall multiple instances when the US helped find the bodies of the missing, including massacre victims and Vietnam POW/MIAs. We've got satellites, we've got sniffer dogs, we've got ground penetrating radar, and (hopefully) we've got people with nothing to hide in this matter.

So, why aren't we helping find them?