Justice Dipak Misra states that Magistrate has to be alive about the allegation brought to him via Non-cognizable case by Police.

From Paras 26 and 27,

26. At this stage it is seemly to state that power under Section 156(3) warrants application of judicial mind. A court of law is involved. It is not the police taking steps at the stage of Section 154 of the code. A litigant at his own whim cannot invoke the authority of the Magistrate. A principled and really grieved citizen with clean hands must have free access to invoke the said power. It protects the citizens but when pervert litigations takes this route to harass their fellows citizens, efforts are to be made to scuttle and curb the same.

27. In our considered opinion, a stage has come in this country where Section 156(3) Cr.P.C. applications are to be supported by an affidavit duly sworn by the applicant who seeks the invocation of the jurisdiction of the Magistrate. That apart, in an appropriate case, the learned Magistrate would be well advised to verify the truth and also can verify the veracity of the allegations. This affidavit can make the applicant more responsible. We are compelled to say so as such kind of applications are being filed in a routine manner without taking any responsibility whatsoever only to harass certain persons. That apart, it becomes more disturbing and alarming when one tries to pick up people who are passing orders under a statutory provision which can be challenged under the framework of said Act or under Article 226 of the Constitution of India. But it cannot be done to take undue advantage in a criminal court as if somebody is determined to settle the scores. We have already indicated that there has to be prior applications under Section 154(1) and 154(3) while filing a petition under Section 156(3). Both the aspects should be clearly spelt out in the application and necessary documents to that effect shall be filed. The warrant for giving a direction that an the application under Section 156(3) be supported by an affidavit so that the person making the application should be conscious and also endeavour to see that no false affidavit is made. It is because once an affidavit is found to be false, he will be liable for prosecution in accordance with law. This will deter him to casually invoke the authority of the Magistrate under Section 156(3). That apart, we have already stated that the veracity of the same can also be verified by the learned Magistrate, regard being had to the nature of allegations of the case. We are compelled to say so as a number of cases pertaining to fiscal sphere, matrimonial dispute/family disputes, commercial offences, medical negligence cases, corruption cases and the cases where there is abnormal delay/laches in initiating criminal prosecution, as are illustrated in Lalita Kumari are being filed. That apart, the learned Magistrate would also be aware of the delay in lodging of the FIR.

From Para 30,

30. In the present case, we are obligated to say that learned Magistrate should have kept himself alive to the aforesaid provision before venturing into directing registration of the FIR under Section 156(3) Cr.P.C. It is because the Parliament in its wisdom has made such a provision to protect the secured creditors or any of its officers, and needles to emphasize, the legislative mandate, has to be kept in mind.

Citations: [AIR 2015 SC 1758], [2015 (3) RLW 2404 (SC)], [2015(3) PLJR 78(SC)], [2015 SCL SC 130 472], [2015 AIOL 3152], [2015 CRIMES SC 2 179], [2015 CRIMES SC 2 209], [2015 CRLJ SC 2396], [2015 JCC SC 2 974], [2015 JT 5 203], [2015 SCALE 4 120], [2015 SCC 6 287], [2015 SLT 3 431], [2015 SUPREME 3 152], [2015 SCC ONLINE SC 272], [2015 CTC 3 103], [2015 KLJ 2 491], [2015 KERLT 2 451], [2015 SCC CRI 4 153], [2015 SCC CIV 3 294]

Indiankanoon.org link: https://indiankanoon.org/doc/163299097/

Casemine link: https://www.casemine.com/judgement/in/5790b242e561097e45a4e25a

The Index for Defamation Judgments is here. Index of Judgments under Sec 156(3) Cr.P.C. are here.