Rav Eliashiv(Divrei Sinai page 45-46): Question: On a number of occasions money has been stolen from the local religious affairs office. It appears that the thief is one of the employees. However we don’t have the means of bringing about a confession. The question is whether it is permitted to turn to the police who after investigation - if they are successful in getting a confession - will bring the person to judgment in a secular court. The consequences of this would be very serious since we suspect someone who has a large family and in addition since he is someone who is involved in religious work it will result in chilul hashem (desecration of G‑d’s name), Heaven forbid! On the other hand, public money is missing and who knows what else.
Answer: See Panim Me’eros (2:155) concerning our issue in which someone found an open chest from which much was stolen. There is reasonable circumstantial evidence that one of the workers was the thief. He was asked whether it was permissible to inform the secular authorities and that this will lead to him to confess … However at the end the Panim Me’eros concludes, “It is improper to turn a Jew over to secular authorities as our Sages say they will treat him like a trapped animal and there is concern that if he confesses they will kill him.” From here it is clear that this ruling is not applicable in our times. Therefore it is permitted to turn to the police. However since you raise the concern that this will lead to a chilul hashem, I can’t render an opinion concerning this since I don’t know how to evaluate it and therefore the matter must be determined by your evaluation.
Answer: See Panim Me’eros (2:155) concerning our issue in which someone found an open chest from which much was stolen. There is reasonable circumstantial evidence that one of the workers was the thief. He was asked whether it was permissible to inform the secular authorities and that this will lead to him to confess … However at the end the Panim Me’eros concludes, “It is improper to turn a Jew over to secular authorities as our Sages say they will treat him like a trapped animal and there is concern that if he confesses they will kill him.” From here it is clear that this ruling is not applicable in our times. Therefore it is permitted to turn to the police. However since you raise the concern that this will lead to a chilul hashem, I can’t render an opinion concerning this since I don’t know how to evaluate it and therefore the matter must be determined by your evaluation.