security measures at airports have increased substantially, and as of late, travelers are routinely put through a body scan that can detect drugs ingested for smuggling - occasionally dogs, trained to sniff out drugs, can be seen in airports around the globe.

if a person gets arrested for carrying, or using drugs, most consulates will not help them - in some cases, drug charges may be communicated to the consulate so the visitor's home country has the incident records

if someone gets stopped by the police and gets falsely accused of carrying drugs, they should not try to solve the problem using bribes, rather insist to be taken to the local police station, delegacia, and solve the problem according to law.

you can also report the incident to internal affairs at (21) 33991199 - 'ouvidoria da polícia' is a service for anyone who wishes to report abuse by the police or local authorities.