detect (something) in (something)
To distinguish the presence of something in something else, typically something that is being masked or is present in only a small quantity. Do I detect sarcasm in that statement, Jane? I think I detect a pinch of cinnamon in this, but I could be wrong.
detect something in something
to recognize or identify something in something. Can you detect the anger in her voice? I detect a bit of sarcasm in your comments.