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

Abstract
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.

Keywords
National security cases; Line-based investigation; Characteristics; Investigative strategies

Cite this paper
Jian-guo ZANG, Characteristics and Investigative Strategies for Line-Based Investigations in Cases Threatening National Security , SCIREA Journal of Sociology. Volume 10, Issue 1, February 2026 | PP. 1-11. 10.54647/sociology841528

References

[ 1 ]	Zheng, W., Li, J. H., & Zhang, Y. (2007). Essentials of "Line-Based Investigation" for Missing Persons Suspected of Being Victims. Chinese Criminal Police, (1), 23-27.
[ 2 ]	Han, D. M. (2006). Response or Initiative: Pattern Selection for Initiating Investigative Procedures. Journal of Shandong Police College, (2), 32-37.
[ 3 ]	Ratcliffe, J. (2008). Intelligence-Led Policing (S. Cui, Trans.). China People's Public Security University Press. (p. 77).
[ 4 ]	Chen, Z. J., Zhang, J., & Jin, X. (2008). Criminal Intelligence Informatics. China People's Public Security University Press. (p. 262).