check out Yeshuran:
you can download it here:
http://www.hebrewbooks.org/49101
starting on page 634,
which has most of the halacha sources with regards to Mesira, when it is mutar, when assur etc..
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check out Yeshuran:
you can download it here:
http://www.hebrewbooks.org/49101
starting on page 634,
which has most of the halacha sources with regards to Mesira, when it is mutar, when assur etc..