You don't want to turn off the logging altogether in a production environment, merely not to send the output to the browser. CGI::Carp will, by default, send the output to stderr, hence to the server log, which you do want in a production environment.

The following snippet should help:

BEGIN {
    my $carp_arg;

    if ($ENV{ENV} =~ /DEV/) {  # or some other test for a non producti
+on env
        $carp_arg = 'fatalsToBrowser';
    }

    use CGI::Carp $carp_arg;
}
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