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Summary

Project website notrace.how
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Project maintainers1 User avatar ntp
Language Chinese (Simplified Han script)
Language code zh_Hans
Text direction Left to right
Case sensitivity Case-insensitive
Number of speakers 1,286,444,445
09/03/2026

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[!collection-of-dna-sample.jpg|right|small-web-default-pdf|centerCaption!]
Collection of a DNA sample using a swab.

DNA forensics is the collection and analysis of DNA samples for the purpose of matching DNA samples to individuals.

DNA is the molecule that contains the genetic code of organisms. Every cell[^With the exception of red blood cells.] in a human body has DNA. Each individual's DNA is unique, with the exception of identical twins. An adversary can compare an individual's DNA with a DNA sample collected from an item or location and, if they match, conclude that the individual was likely in contact with that item or location.

# Transfer

Human body cells and the DNA they contain can directly transfer from the body to the environment. For example:

- When you sweat, urinate, defecate, or bleed, you leave sweat, urine, feces, or blood.
- When you breathe or speak, you emit respiratory droplets from your mouth and nose that contain saliva and mucus.
- When you touch a surface with your skin, skin cells transfer from your skin to the surface.
- Even when you're not doing anything, you are constantly shedding skin cells and hair.

Human body cells can also transfer indirectly. For example, if you touch the outside of a pair of gloves with your fingers, then put the gloves on and touch a door handle, your skin cells can transfer first from your fingers to the outside of the gloves and then from the outside of the gloves to the door handle.

See the "Transfer" section of the [No Trace Project DNA Literature Review](res://#dna-review) for more details on direct and indirect DNA transfer.

# Degradation

DNA is very robust and does not easily degrade, but it can degrade under certain conditions, such as when exposed to high temperatures or sodium hypochlorite.

See the "Degradation" section of the [No Trace Project DNA Literature Review](res://#dna-review) on the conditions under which DNA can degrade.

# Collection

An adversary can collect a DNA sample:

- From a surface known to contain DNA, such as a visible biological mark (e.g. saliva or blood).
- From a surface suspected of containing DNA, such as a door handle suspected to have been touched by a suspect at an action site.

An adversary can use techniques to facilitate DNA collection, such as:

- Soot removal techniques to collect DNA samples hidden beneath soot after a fire.
- Luminol to locate blood samples invisible to the naked eye.

# Analysis

An adversary can analyze a DNA sample to identify genetic markers of the DNA. Such an analysis is successful if:

- The sample contains enough DNA. For example, a drop of blood contains significantly more DNA than skin cells left through brief contact between skin and a surface.
- The DNA isn't too degraded.
- All or most of the DNA in the sample is from at most three individuals.

An adversary can compare *two* successfully analyzed DNA samples to:

- Determine whether they come from the same individual. For example, they can compare a DNA sample collected from the mouth of a suspect in custody to a DNA sample collected at an action site and, if they match, conclude that the suspect was likely present at the action site.
- Determine whether they come from individuals closely related genetically, such as parents and their children, siblings, or cousins.

An adversary can also use a *single* successfully analyzed DNA sample to:

- Determine the individual's genetic sex.
- Attempt to predict the individual's appearance using forensic DNA phenotyping. Currently, eye, hair, and skin color can be predicted with relatively high accuracy, and research is ongoing to attempt to predict other characteristics. This technique is not used in all contexts.

# DNA databases

In many countries, the State has DNA databases containing the DNA of many individuals, often obtained during arrests or as part of criminal convictions.

Countries can exchange DNA data with each other through:

- International DNA databases, such as the Interpol DNA database or the Europol Information System.
- Linked or networked national DNA databases. For example, European Union member states are required to maintain a DNA database that other member states can access.
- Request-based exchange of DNA data, typically in cases of serious crimes.

# See also

- [DNA You Say? Burn Everything to Burn Longer: A Guide to Leaving No Traces](res://#dna-you-say) for an overview of DNA forensics.
- The [No Trace Project DNA Literature Review](res://#dna-review) for a collection of useful details on DNA forensics, taken from academic literature.
- The ["DNA" topic](res://#topic=dna).
 
techniques.forensics.dna.description
08/04/2026
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Covert surveillance devices are electronic devices hidden by an adversary to collect data: audio, video, and location data.

# Where

An adversary can hide covert surveillance devices in buildings, in or on vehicles, or outdoors. Notable locations include:

- Microphones and cameras hidden inside the home of a target.
- Location trackers hidden in or on the vehicle of a target.
- Cameras hidden at the windows of a building close to the home of a target, such that the cameras can film the entrance to the home.

# When

An adversary can hide covert surveillance devices for long-term surveillance (e.g. weeks, months or years), or short-term surveillance of specific events. A covert surveillance device can disappear:

- Most often, when it is retrieved by its installers.
- In some cases, when it is inadvertently discovered and removed by the people under surveillance.
- In rare cases, when it is deliberately discovered (through a [bug search](tl://mitigations/bug-search.html)) and removed by the people under surveillance.

# Power supply

Covert surveillance devices require a power supply, which can be either a battery or the electrical system of the building or vehicle in which the device is hidden, or both. In rare cases, they may be powered by Power over Ethernet (PoE). To save battery power and make it harder to detect them, devices may not be powered on all the time.

# Data transmission

Covert surveillance devices often transmit the data they collect:

- Most often for low-cost modern devices, over the mobile phone network using a SIM card included in the device.
- In some cases over WiFi, Bluetooth, Ethernet, or arbitrary radio frequencies.

Some devices never transmit the data they collect: to retrieve the data, the adversary needs to physically access them.

# See also

- [Ears and Eyes](eae://).
- The ["Hidden devices" topic](res://#topic=hidden-devices).
 
techniques.covert-surveillance-devices.description
08/04/2026
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A covert house visit is a discreet visit of a residence conducted by an adversary when the occupants are not present.

An adversary can conduct a covert house visit to:

- Gather information.
- Install [covert surveillance devices](tl://techniques/covert-surveillance-devices.html) in the residence.
- Install [malware](tl://techniques/targeted-digital-surveillance/malware.html) on digital devices.

Generally, when an adversary conducts a covert visit of a residence, they do not want the occupants to know that the operation has taken place. Therefore, in general:

- If the residence has locked doors, the adversary must bypass the doors without visibly breaking them. They can do this by picking the locks or asking the building owner for the keys.
- The adversary refrains from seizing items or moving things.

In addition to visiting the residence, the adversary can covertly seize garbage from outside the residence in the hope of finding valuable information (e.g., written notes, forensic evidence such as DNA traces).
 
techniques.covert-house-visit.description
08/04/2026
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