Infer why Adolphe Le Bon is arrested for the murders; this would make him a __________.

Adolphe is arrested because he is one of the last to see Madame L'Espanaye alive. He is a suspect, and he is possibly being viewed as an accessory to the crime..... he may also be a scapegoat, arrested for no other reason than they needed an arrest.

“Adolphe Le Bon, clerk to Mignaud et Fils, deposes that on the day in question, about noon, he accompanied Madame L'Espanaye to her residence with the 4000 francs, put up in two bags. Upon the door being opened, Mademoiselle L. appeared and took from his hands one of the bags, while the old lady relieved him of the other. He then bowed and departed. Did not see any person in the street at the time. It is a byestreet—very lonely.

A postscript, however mentioned that Adolphe Le Bon had been arrested and imprisoned—although nothing appeared to criminate him, beyond the facts already detailed.