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The police are reluctant to file charges in medical-error cases.
Literal
Police [subject-が] medical-accident [attributive-の] filing-charges [to-に] reluctant is-[copula-だ].
Editorial/news opinion. 立件 ('filing criminal charges, building a case') is a legal-procedural term. 消極的 ('negative, reluctant, passive') contrasts with 積極的 ('positive, proactive, active'). Together they form a common pair in discourse about attitudes and policies. 医療事故 ('medical accident, medical malpractice') is a sensitive public-health topic.