MP.L2-3.8.8 · Level 2

Prohibit the use of portable storage devices when such devices have no identifiable owner.

NIST SP 800-171 Rev 2 · §3.8.8

Assessment objectives

From NIST SP 800-171A · 1 objective must be met to satisfy this control

3.8.8[a] Prohibit the use of portable storage devices when such devices have no identifiable owner.

Examine

[SELECT FROM: System media protection policy; system use policy; procedures addressing media usage restrictions; security plan; rules of behavior; system design documentation; system configuration settings and associated documentation; system audit logs and records; other relevant documents or records].

Interview

[SELECT FROM: Personnel with system media use responsibilities; personnel with information security responsibilities; system or network administrators].

Test

[SELECT FROM: Organizational processes for media use; mechanisms prohibiting use of media on systems or system components].

What we look for in practice

The following are placeholder notes that should be refined based on practice experience.

What assessors look for in practice. Documented evidence that this control is implemented across all CUI-handling systems within scope. Specific artifacts vary, but expect requests for written procedures, system configurations, and operational records demonstrating the control is active.

Common failure patterns. Typical issues include incomplete documentation, inconsistent implementation across systems, and missing periodic review records. Refine this section as your practice accumulates direct assessment experience.

Strong evidence looks like. Formal policy referencing this control, technical configurations demonstrating enforcement, periodic review logs with sign-off, and procedures for handling exceptions.

Scoring and POA&M context. 3-point control under the DoD Assessment Methodology. Meaningful but more contained scoring impact. Not POA&M-eligible — must be implemented at assessment time.