The drawbacks of legalization do not imply that our current version of prohibition is the optimal drug strategy; it may well be possible to implement prohibition in less harmful ways.
Due to the drawbacks may not be possible to implement prohibition in less harmful ways.
( z1 possible :polarity - :ARG1 ( z2 implement :ARG1 ( z3 prohibit ) :manner ( z4 way :ARG1-of ( z5 have-degree :ARG2 ( z6 harm :ARG0 z4 ) :ARG3 ( z7 less ) ) ) ) )