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Paragraph
9
of
the
Joint
Declaration
stated
that
the
law
must
clearly
specify
the
criteria
to
be
used
for
determining
the
cases
in
which
such
surveillance
is
legitimate
for
national
security
purposes
and
that
such
measures
shall
be
authorised
only
in
the
event
of
a
clear
risk
to
protected
interests
and
when
the
damage
that
may
result
would
be
greater
than
society
’s
general
interest
in
maintaining
the
right
to
privacy
and
the
free
circulation
of
ideas
and
information
.
In
any
event
,
the
collection
of
this
information
is
to
be
monitored
by
an
independent
oversight
body
and
governed
by
sufficient
due
-
process
guarantees
and
judicial
oversight
,
within
the
limitations
permissible
in
a
democratic
society
.
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