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The
PACE
expressed
its
clear
preference
for
extensive
a
priori
and
ex
post
facto
judicial
control
of
surveillance
activities
with
a
high
potential
to
infringe
upon
human
rights
,
on
the
basis
of
“
probable
cause
for
belief
that
an
individual
is
committing
,
has
committed
,
or
is
about
to
commit
an
offence
”
,
or
“
probable
cause
for
belief
that
particular
communications
or
specific
proof
concerning
that
offence
will
be
obtained
through
the
proposed
interception
or
house
searches
,
or
that
(
in
the
case
of
arrest
)
a
crime
can
thus
be
prevented
”
and
“
normal
investigative
procedures
have
been
attempted
but
have
failed
or
appear
unlikely
to
succeed
or
be
too
dangerous
.
”
The
authorisation
to
undertake
this
kind
of
operative
activity
should
be
time
-
limited
(
to
a
maximum
of
three
months
)
.
Once
observation
or
wire
-
tapping
has
ended
,
the
person
concerned
should
be
informed
of
the
measure
taken
.
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