Idrāj is not established by intuition alone. Its detection rests on comparing multiple chains and wordings, a reliable route explicitly distinguishing the added passage, the inserting narrator's own clarification, or the judgment of skilled hadith critics. Sometimes the content itself shows that the words could not have been uttered by the Prophet ﷺ.
A working method:
1. Collect independent versions and their chains.
2. Mark where wording occurs in only some versions.
3. Check whether a route attributes it separately: “So-and-so said ...”
4. Weigh narrator precision and the strength of the variants.
5. Record the proper attribution of each portion.
Even a harmless gloss must not be elevated into prophetic wording. Nor should every additional phrase be rejected as idrāj: reliable additions constitute a separate technical discussion.