In R. v. Morelli, 2010 SCC 8 the following statement was made on behalf of the majority (McLachlin C.J. and Binnie, Abella and Fish JJ)
[36] On my view of possession, the automatic caching of a file to the hard drive does not, without more, constitute possession. While the cached file might be in a “place” over which the computer user has control, in order to establish possession, it is necessary to satisfy mens rea or fault requirements as well. Thus, it must be shown that the file was knowingly stored and retained through the cache.
