i would suggest inverting your logic to use three hashes, my (%passed, %failed, %untested); (i'm not sure you need a fourth). once you get the browser type, test for existence of the key in the three hashes. if it doesn't exist in the third, add the key, then redirect. a lengthier example might look like:

my (%passed, %failed, %untested);
%passed = { 
    MSIE50NT => 1, 
    MSIE55NT => 1, 
    URI_REDIRECT => 'http://passaddress/', 
};
# set %failed and %untested

my $br_detect = 'palm'; # as found by HTTP::BrowserDetect
if( defined $passed{$br_detect} ) { redirect( $passed{URI_REDIRECT} ) 
+}
if( defined $failed{$br_detect} ) { redirect( $failed{URI_REDIRECT} ) 
+}
defined $untested{$br_detect} ? '' : %untested{$br_detect} = 1;
redirect( $untested{URI_REDIRECT} );

sub redirect {
# your redirect logic here...
}
[download]

~Particle ;Þ

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