在Money Heist S2E1中，女檢查員的丈夫收集了教授燒製的照片。警察如何根據那張很小的燒照片確定教授的身份？
If you see from starting that professor had a plan for everything, except few things which can be seen in later episodes. Each mistakes according to him could lead to the identity of him. So he carry outs some different plans to get out of those mistakes.
So from the start only we were told that Lady inspector
(Raquel murillo) husband was a master in his work. When the police came to found out the plot where the heist was been planned, there were photos and papers related to the heist which was burned which and can be easily traced with some scientific things. Possibly leading to professor and his teams.
Due to this he plotted an plan to argue with her husband so he could get time to replace those tiny burned papers with some other burned papers.
I hope this clears your doubt.