New Trend: 'Swatting'

[theshadowknows]

If they can find them, it's easy to buy a burner phone, make a call and throw it in the trash.
At most, they can find the location from where the call was made.

Agreed. Plus the cops aren't likely to put that extra amount of effort into a trace unless its high profile enough to get the feds involved. Then they can get data from NSA, and build a fake evidence trail to justify it. They do that with DEA investigation so they can eavesdrop without a warrant.