But that's not really passive voice because the subjects and objects are implied, and in practical use they will have been indexed previously in the conversation.
Just a point I'd like to make. That there is no proof of there ever being a passive voice or one being handed down from what ASL has its origins in.
ASL has its origins in Old French Sign Language , Natural gestures, and Martha's Vineyard Sign Language.
source:
Groce, Nora Ellen (1988). Everyone Here Spoke Sign Language: Hereditary Deafness on Martha's Vineyard. Cambridge: Harvard University Press. ISBN 0-674-27041-X.
Lane, Harlan L. (1984). When the mind hears: A history of the deaf. New York: Random House. ISBN 0-394-50878-5.
Padden, Carol; & Humphries, Tom. (1988). Deaf in America: Voices from a culture. Cambridge, MA: Harvard University Press. ISBN 0-674-19423-3.
Sacks, Oliver W. (1989). Seeing voices: A journey into the land of the deaf. Berkeley: University of California Press. ISBN 0-520-06083-0.
Stokoe, William C. (1976). Dictionary of American Sign Language on Linguistic Principles. Linstok Press. ISBN 0-932130-01-1.
Stokoe, William C. (1960). Sign language structure: An outline of the visual communication systems of the American deaf. Studies in linguistics: Occasional papers (No. 8). Buffalo: Dept. of Anthropology and Linguistics, University of Buffalo.
Old French sign language used Directional verbs, something entirely different then what a passive voice is.
source:
Desloges, Pierre; 1779, Observations d’un sourd et muet, sur un cours élémentaire d’éducation des sourds et muets, Published in 1779 by M. l’Abbé Deschamps (Chapelain de l’Église d’Orléans), Amsterdam and B. Morin, Paris.
Natural gestures are just "body language"; actual languages with grammatical structure, syntax, etc.. are something entirely different.
Building Languages: Natural Gestures
Martha's Vineyard Sign Language, not much is known about this as its extinct. It was, however, supposedly based on the Old Kent System, which is also extinct.
source:
Groce, Nora Ellen (1985). Everyone here spoke sign language: Hereditary deafness on Martha's Vineyard. Harvard University Press. ISBN 0-674-27040-1.
Jackson, Peter (2001). A Pictorial History of Deaf Britain.