Finding co-linear "lines", aka extremely thin triangles

Lately I’ve been running afoul of faces that appear as “lines”, but I suspect are extremely thin triangles.

They show up as a “line” that appears to run further or past what one would expect to be one endpoint.

Is there a way to (easily) detect such faces? They are a PITA.

A screenshot of what your mesh will help alot.

Here is a way to select triangles. After selecting, you can press G and check if those lines got selected or not
select triangles