Quick Answer: What Is Infidelity DNA Testing?
Infidelity DNA testing analyzes clothing, bedding, and personal items to determine whether biological material such as DNA or bodily fluids may be present. These tests can detect biological evidence and may compare DNA profiles to reference samples to determine whether an individual may be a contributor.
What Is Infidelity DNA Testing?
Infidelity DNA testing involves the analysis of personal items for biological evidence that may indicate intimate contact.
Rather than testing a person directly, these tests examine items such as clothing or bedding to determine whether biological material may be present.
Laboratories may look for:
DNA from skin cells
Bodily fluids such as semen or saliva
Biological material deposited during physical contact
If biological evidence is detected, laboratories may attempt to generate DNA profiles that can be compared to reference samples.
Types of Infidelity DNA Tests
Several different types of testing may be used depending on the type of evidence being investigated.
DNA Detection on Personal Items
Many infidelity tests analyze items for the presence of DNA.
Common items submitted for testing include:
Underwear
Bedsheets
Towels
Clothing
Condoms
If DNA is present on the item, laboratories may attempt to generate a DNA profile and determine whether the DNA belongs to one individual or multiple contributors.
Learn more about how DNA evidence may appear on items here: How Long Does DNA Stay On Clothing.
Bodily Fluid Detection Testing
In some situations, laboratories may perform tests designed to detect biological fluids.
These tests may identify substances such as:
Semen
Saliva
Blood
Urine
Detecting these substances can provide additional information about how biological evidence may have been deposited on an item.
Learn more about bodily fluid detection testing here: How Semen Detection Tests Work.
Confirmatory Semen Detection Testing
Some laboratories perform confirmatory semen detection testing to determine whether seminal fluid may be present on an item.
The semen detection test offered by Validity Genetics is a confirmatory RSID semen detection test that identifies the human-specific protein semenogelin.
Because semenogelin is specific to human seminal fluid, detecting this protein provides strong scientific evidence that seminal fluid may be present on the tested item.
Learn more about how these tests work here: How Semen Detection Tests Work.
Presumptive vs Confirmatory Tests
Some laboratories may use presumptive screening tests before performing confirmatory analysis.
Examples of presumptive semen tests include:
PSA (Prostate-Specific Antigen) testing
Acid Phosphatase (AP) testing
These screening tests may suggest that semen could be present, but they are not always specific to seminal fluid.
Confirmatory tests such as RSID semen detection testing identify proteins specific to semen and provide stronger scientific confirmation.
Mixed DNA Profiles
It is common for personal items to contain DNA from more than one individual.
For example, clothing or bedding may contain biological material from multiple contributors due to normal handling or contact.
Laboratories analyze these mixed DNA samples to determine how many individuals may have contributed biological material.
Learn more about mixed DNA results here: Multiple DNA Profiles Found.
Can DNA Evidence Reveal Intimate Contact?
DNA and bodily fluid testing can reveal the presence of biological evidence on an item. In some situations, this evidence may suggest that intimate contact occurred.
However, interpreting the context of biological evidence requires careful consideration of the circumstances surrounding the item and how it may have been handled.
Learn more about how DNA evidence may be interpreted here: Can DNA Prove Cheating.
Items Commonly Submitted for Infidelity Testing
Many different types of personal items may contain biological evidence.
Common examples include:
Underwear
Bedsheets
Towels
Clothing
Tissues
Personal fabrics
Because fabrics can retain biological material, laboratories may be able to analyze these items for DNA or bodily fluids.
How Long Biological Evidence Can Remain on Fabrics
Biological evidence may remain detectable on fabrics depending on environmental conditions and how the item was handled.
Factors that influence detectability include:
Washing
Fabric type
Environmental exposure
Time since deposition
Learn more about this topic here: Can Semen be Detected After Washing?.
Sample Types Used in Infidelity DNA Testing
The most common samples submitted for infidelity DNA testing are non-standard samples, which are personal items that may contain biological material.
Examples include:
Clothing
Bedding
Personal fabrics
Items containing biological stains
Learn more about non-standard DNA samples here: NSS Sample That Can be Used In DNA Testing.
Using DNA Evidence to Find Answers
Infidelity DNA testing provides scientific methods for detecting biological evidence on personal items. By analyzing DNA and bodily fluids, laboratories may identify biological material that could help individuals better understand what may have occurred.
Understanding how these tests work helps individuals interpret laboratory results and make informed decisions about testing options.
