Characteristics and Investigative Strategies for Line-Based Investigations in Cases Threatening National Security

Line-based investigation is a pre-filing investigative system in China. It is employed by investigative agencies that, upon receiving leads on suspected crimes threatening national security, lack sufficient evidence to formally open a case. Through analysis and vetting, preliminary assessments are made, prompting proactive, specialized investigations based on relevant intelligence to uncover criminal facts and identify suspects. This approach is an investigative model targeting crimes that are in progress or in preparation. Line-based investigation is characterized by its systematic organization, clear objectives, proactive nature, unspecified targets, and phased process. Its investigative strategies include conducting intelligence analysis, executing field verification, strengthening investigative control, managing operational development, and emphasizing enforcement and case resolution.