Tokens: 75
.
The
principle
of
legality
in
the
field
of
criminal
law
,
both
in
its
positive
(
retrospectivity
of
lex
mitior
)
and
negative
versions
(
prohibition
on
retrospectivity
of
lex
gravior
)
,
is
customary
international
law
,
binding
on
all
States
,
and
peremptory
law
with
the
effect
that
no
other
rule
of
international
or
national
law
may
derogate
from
them.[205
]
This
principle
of
ius
cogens
applies
fully
to
preventive
detention
.
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