[berkut]

Note: That analysis (ELA) only really looks at gradient/diff of compression artefacts in pratice, so if you losslessly edited the original from the RAW source at full float32 (say in Nuke or something which supports full precision workflows) and then exported to another file, that wouldn't show anything.

In other words, it's mostly only good for detecting if a JPEG (with compression artefacts) was edited and saved to another JPEG, although even then you can work around it to some degree by saving at similar chroma and compression qualities if you know what you're doing.