[Stoat]

How does the US stop Sri Lanka and other countries from spraying DDT?
 

Do these countries even have stockpiles of DDT, or even the means by which to disperse it on such a massive scale?  Once again, only the US has the means to get such a meaningful thing done.  Sadly, I believe that it will once again be thwarted due entirely to irrelevant political reasons rather than any sound scientific ones.

[secretagent]

I doubt an active patent on DDT limits its production.

I'll guess that the countries' own western-educated elites suppress its use.

Or foreign aid depends on banning DDT.