As Colombian President Gustavo Petro prepares to face US President Donald Trump in Washington, his anti-drug strategy has fallen under scrutiny.

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Tumaco, Colombia – A thin drizzle falls as farmer Yuli Caicedo crouches at the base of a short, spindly bush and grips its stem.

Wrenching it from the damp earth, she tosses it aside, just as dozens of others are doing. The field around them swiftly becomes a graveyard for uprooted coca plants.