Someone or something is present and easily discernible if they are visible.
Only a few soldiers were visible to me.
Housing shortages and poverty are still widespread issues.
Evidence is often compared to demonstration, proof, manifest, and display.
These terms all imply "to reveal or make apparent to the outside world," but evidence indicates that they also serve as evidence of something's reality or existence.
An illustration of this would be a witness identifying a defendant in court as the "guy I witnessed robbing a grocery store."
This is sometimes referred to as direct or prima facie proof.
Any object or substance connected to a crime can be considered physical evidence.
No matter how big or how small, as long as it's concrete

EMCDDA:

The go-to source for information on drugs and drug addiction in Europe is the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA).

keeps track of the drug issue in Europe (including emerging trends)
monitors the use of remedies to drug-related issues
provides data on EU countries' best practices and encourages sharing of that information
evaluates the dangers of novel psychoactive compounds
operates a new psychoactive substance early warning system
creates tools and techniques to aid the European Commission in monitoring and evaluating EU policies as well as the monitoring and evaluation of national policies by EU member states.