Not necessarily true. perldoc expects POD, which can be internal or external to a particular module's source code, it is possible to remove the documentation and still have the module installed. Slightly better would be to just invoke the perl interpreter with -M and see if it spits out an error. For instance,
perl -MCGI (hangs waiting for input, use Ctrl+c to end)
perl -MCGI -e1
perl -MCGId Can't locate CGId.pm in @INC (@INC contains: /usr/local/lib/perl5/5.6.1/sun4-solaris /usr/local/lib/perl5/5.6.1 /usr/local/lib/perl5/site_perl/5.6.1/sun4-solaris /usr/local/lib/perl5/site_perl/5.6.1 /usr/local/lib/perl5/site_perl .). BEGIN failed--compilation aborted.
perl -MCGId -e1
(1 is a valid perl program; it returns 1)
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