Recording & Evidence Management

What is the primary purpose of CCTV recording in a security context?

• AMonitoring staff productivity and timekeeping throughout the working day
• BDeterring and documenting incidents for investigation and evidence✓
• CEntertainment
• DTraining purposes only

Answer: CCTV recording serves to deter crime and provide forensic evidence for investigations.

What is the recommended retention period for CCTV footage in retail environments under UK best practice?

• A2-4 weeks (depending on risk assessment and incident likelihood)✓
• BForever
• C1 year
• D1 week

Answer: Typical retention for retail CCTV is 2-4 weeks, balancing evidence needs with storage costs.

What does 'chain of custody' mean in the context of CCTV evidence?

• AThe physical location of storage devices
• BA documented record of who has accessed, handled, and authenticated evidence to maintain integrity✓
• CThe scheduling of recordings
• DThe cable connections of the system

Answer: Chain of custody documents every person who handled evidence and when, proving it hasn't been tampered with.

When extracting CCTV footage as evidence, what should be documented?

• AOnly the filename of the extracted footage and the name of the folder it was copied into
• BDate/time extracted, person extracting it, incident details, and system location✓
• COnly the incident time
• DNothing - just take the footage

Answer: Proper documentation of extraction is essential for evidence admissibility and chain of custody.

What does encoding video mean in CCTV systems?

• AHiding the footage
• BRecording audio
• CAdding encryption only
• DConverting raw video into a compressed digital format (e.g., H.264, H.265) for storage and transmission✓

Answer: Encoding compresses video using algorithms like H.264 or H.265, reducing file size while maintaining acceptable quality.

What is the benefit of using H.265 encoding instead of H.264 in modern CCTV systems?

• ARequires noticeably less processing power in both the camera and recorder
• BIdentical file size and picture quality, so there is no practical gain
• CReduces file size by approximately 50% for similar quality✓
• DIncreases the file size in exchange for a sharper picture at the same bitrate

Answer: H.265 (HEVC) is more efficient than H.264, achieving similar quality with roughly half the file size.

What is 'continuous recording' versus 'event-based recording'?

• AContinuous records all video; event-based records only when motion/alerts occur, saving storage✓
• BContinuous is cheaper
• CEvent-based recording captures everything, while continuous recording is triggered only by an alarm
• DSame thing

Answer: Continuous recording runs all the time; event-based only records when triggered by motion or alerts.

How should CCTV footage be stored to prevent data loss?

• AOn a single internal hard drive without any backup, replacing it once it fills up
• BOn removable USB drives only
• CNo special precautions needed
• DWith backups, redundancy (RAID), and in a secure, access-controlled location✓

Answer: Proper CCTV storage includes backups, RAID configurations, secure locations, and access controls.

What must be ensured before deleting CCTV footage under UK GDPR?

• ANothing - it can be deleted anytime
• BThat retention period has expired AND no pending investigations involve that footage✓
• COnly manager approval
• DPolice notification

Answer: Before deletion, ensure retention policies are met and that footage is not needed for investigations.

What is the significance of a timestamp on CCTV footage?

• AIdentifies the camera only
• BProvides exact date/time for evidence correlation and investigation sequencing✓
• CJust a label
• DDetermines the recorded video quality by setting how many frames are stored each second

Answer: Accurate timestamps are critical for evidence - they establish when incidents occurred and help correlate events.

What is video compression and why is it necessary in CCTV systems?

• AReducing the number of cameras
• BEncoding video into smaller file sizes for storage efficiency while maintaining acceptable quality✓
• CShortening recording duration
• DLowering image resolution

Answer: Compression reduces file sizes significantly, making CCTV storage financially practical.

When providing CCTV footage to police or courts, what should be included?

• AJust the video file
• BVerbal explanation only
• COnly a description
• DVideo file, chain of custody documentation, system details, extraction date/time, and certification of authenticity✓

Answer: Legal disclosure of CCTV footage requires detailed documentation to establish admissibility and authenticity.

What is the 'bitrate' setting in CCTV recording?

• AThe zoom level
• BThe amount of data (megabits) used per second - higher bitrate = better quality but larger file size✓
• CThe brightness level
• DThe colour depth

Answer: Bitrate determines video data flow; higher bitrates provide better quality but require more storage.

What should be done if CCTV footage is corrupted or unreadable?

• AAttempt to repair the file yourself using video recovery software downloaded online
• BOverwrite it with new footage so that the storage space is not wasted on the drive
• CDiscard it silently
• DDocument the issue, report it to management, and preserve any backup copies✓

Answer: Corrupted footage should be documented as an incident and reported, with backups checked for integrity.

What is the purpose of frame rate in CCTV recording?

• AVideo duration
• BDetermines the image brightness by setting the level of gain applied to the sensor
• CZoom capability
• DNumber of still images per second (higher FPS = smoother motion but larger files)✓

Answer: Frame rate (e.g., 25fps, 30fps) determines video smoothness; more frames mean smoother motion and larger files.

Under UK law, can CCTV footage be used as evidence in court without authentication?

• ANo - it must be authenticated with a certificate of authenticity and chain of custody documentation✓
• BOnly if recorded digitally
• COnly with police permission
• DYes - it's always admissible

Answer: CCTV evidence requires authentication and chain of custody documentation for court admissibility.

What is a 'keyframe' in CCTV video encoding?

• AA critical image stored completely; other frames reference it, improving compression efficiency✓
• BA full image frame compared to reference frames
• CThe single frame with the best picture quality in a recording, which is kept at full resolution for evidence
• DA frame recorded per second only

Answer: Keyframes are complete image frames; subsequent frames only encode changes from the keyframe, improving compression.

How should incident footage be extracted for evidence purposes?

• AVia USB stick without any documentation, provided the file is copied straight from the recorder
• BBy any staff member
• CWithout logging who extracted it, provided the incident reference number is written on the file
• DUsing proper procedures with audit trails, timestamps, and authorisation documentation✓

Answer: Evidence extraction must follow formal procedures with documentation and authorisation to maintain chain of custody.

What does 'resolution degradation' mean in CCTV recordings?

• ACameras breaking down and needing replacement
• BReduced screen brightness on the control room monitors over time
• CIntentional reduction of image quality to save storage
• DFootage becoming unclear over time✓

Answer: Resolution degradation refers to stored footage becoming unclear or compressed during extended retention.

What metadata should be preserved with CCTV evidence?

• AJust the footage itself
• BFile creation date, modification date, extraction details, system details, and integrity checksums✓
• COnly the incident description
• DOnly filename

Answer: Metadata documenting evidence history, creation, and integrity is essential for admissibility.