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use strict;
use warnings;
...
unwatch $h;

$h->{email} = 'foo@bar.com';

$perl carnivore.pl
# variable is now under observation
> %h: "fname" changed from "" to "Foo"  at carnivore.pl line 10
> %h: "lname" changed from "" to "Bar"  at carnivore.pl line 13
# mission completed