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DNA evidence can help identify or exclude a possible contributor in a Minnesota criminal sexual conduct case. It does not automatically explain how material arrived, when an event occurred or whether a particular act was consensual. Review the laboratory findings together with the specific charge and the rest of the evidence.
What question does the DNA report answer?
Start with the exact item tested and the report’s conclusion. A result from a clothing sample, a swab or another item should not be described more broadly than the analysis supports. Ask which samples were tested, which were not, and what comparison was performed.
NIST explains that DNA mixtures and very small quantities can require substantial interpretation. Mixtures are not inherently reliable or unreliable; the sample and method matter. A mixture containing genetic features consistent with a person does not automatically establish that the person contributed it.
NIST also distinguishes possible contributors from how or when DNA was deposited. Secondary transfer can occur, but its possibility does not establish that it happened in a particular case. Evaluate the proposed explanation against the circumstances and other evidence.
A likelihood ratio is not a probability of guilt
The Federal Judicial Center explains that a likelihood ratio compares the probability of the observed DNA results under competing contributor assumptions. It is not the probability that the accused is guilty or innocent.
Ask the analyst or reviewing expert to identify both propositions, the assumed number of contributors, relevant relatedness assumptions and the method’s validation for the sample. A large number should not be converted into a percentage chance of guilt. The statistical question and the legal question differ.
DNA and consent under Minnesota law
Section 609.341 defines consent in terms of a freely given present agreement, shown by words or overt actions, to the particular act. A relationship or failure to resist does not establish consent. A person who is mentally incapacitated or physically helpless as defined by the statute cannot consent.
The same statute does not require corroboration of testimony to show lack of consent. Absence of DNA therefore does not automatically end a prosecution. Conversely, identifying a possible DNA source does not by itself resolve consent. Counsel must review the elements of the particular charged offense; do not assume every CSC charge requires the same proof.
What can counsel and an expert examine?
- Collection and handling: Where was the sample collected, how was it packaged, and who handled it?
- Item identification: Do the submission records and report identify the same items and comparison samples?
- Laboratory work: What testing, controls, review and documentation support the conclusion?
- Interpretation: Is the result a single-source profile, a mixture, an exclusion, an inconclusive result or another finding?
- Limits: What does the method support, and what does the analyst expressly decline to conclude?
- Remaining material: Is further examination or testing feasible, and what procedures must be followed?
These are questions to investigate, not assertions that an error occurred. A concern about handling requires analysis of the actual record and its effect. Do not promise exclusion of evidence merely because a document is missing from the papers you received.
Expert testimony and possible challenges
Minnesota Evidence Rule 702 addresses qualified expert testimony that helps the factfinder and requires foundational reliability. For novel scientific theory, it also requires general acceptance of the underlying science in the relevant scientific community.
An attorney can assess whether a dispute concerns admissibility, the meaning or weight of a result, or a need for additional expert review. A motion, cross-examination and further testing are different tools. Their availability and value depend on the case; neither exclusion nor dismissal should be guaranteed.
Prepare for a consultation
Bring the complaint, court notices and every laboratory report you have, including attachments and supplemental reports. Make a list of missing materials or unanswered questions. Mention the next court date and any deadline when requesting an appointment.
Keep potential evidence intact. Do not wash, discard, alter or privately test an item that may matter to the case without first obtaining legal guidance. Ask counsel how any preservation or independent examination should be arranged.
Frequently asked questions
Should I order a consumer DNA test to challenge the report?
Discuss the actual forensic question with counsel first. Do not assume a consumer test answers the laboratory’s question or follows the procedures needed for the case. Avoid sending sensitive genetic information to a service without understanding the purpose and process.
Does a result described as a match mean the case is over?
No. Obtain the precise written conclusion and supporting explanation. Counsel must consider what it supports, what remains disputed and how it relates to the charged elements.
Can the firm promise that an expert will find a mistake?
No. A review may confirm the laboratory’s work or identify a meaningful issue. Ask what review is proposed, what materials are needed and what the scope and cost would be.
Discuss your Minnesota case
Read about Minnesota sex-crime defense or the Minneapolis criminal defense practice, or contact Martine Law to request a consultation.
A Director of Client Engagement (non-attorney) can assist with intake and scheduling but does not give legal advice. An attorney evaluates the legal issues and any need for forensic review.
