All reports of macos-resource-fork-file-in-package for the archive. The extended description of this tag is:
There is a file in the package with a name starting with ._, the file name pattern used by Mac OS X to store resource forks in non-native file systems. Such files are generally useless in Debian packages and were usually accidentally included by copying complete directories from the source tarball.
This tag has not been emitted in any package tested by Lintian.