Please note: The algorithm descriptions in English have been automatically translated. Errors may have been introduced in this process. For the original descriptions, go to the Dutch version of the Algorithm Register.
Search application cold cases
- Publication category
- Other algorithms
- Impact assessment
- DPIA, ...
- Status
- In use
General information
Theme
Begin date
Contact information
Responsible use
Goal and impact
The algorithm helps detectives find information in a cold case file. Instead of searching for exact words (as with CTRL-F), it looks for the meaning of words. This makes it possible to find information faster and more completely.
Considerations
This is about doing justice to victims and the victim's relatives. The police want to continue investigating whether there are chances to solve a cold case. Files have gone through the hands of several detectives. This can make retrieving information difficult and time-consuming. With the cold cases search application, information can be found much faster.
Human intervention
Investigators start by reading the file to get a good understanding of the cold case. Sometimes they want to find information they have read before, or they look for new details. The cold cases search application helps with this by quickly finding pieces from the case file that are important. The search results show the words/phrases that have a semantic relationship with the search query. The investigator can therefore determine which search result is relevant and can read the original file from the search result. This information can help the searcher further in the investigation.
Risk management
A Data Protection Impact Assessment (DPIA) and an ethics quick scan were carried out. In addition, an Ethics & Law plan of action and assessment were prepared (based on the Ethical Guidelines for Trustworthy AI) and the General Court of Auditors' Algorithm Framework was checked. Measures were taken based on the risks and recommendations.
Legal basis
Article 8 Wpg when it comes to mutations in the context of regular police practice.
Article 9 Wpg when it comes to official reports drawn up from the initial investigation.
Links to legal bases
Impact assessment
- Data Protection Impact Assessment (DPIA)
- Quickscan ethiek
Operations
Data
The algorithm uses an open-source language model that only supports Dutch. No police data was used in the development of this model.
Technical design
The user selects a cold case file to search in it. The user enters a query through the user interface, in the form of text. This text is converted into a vector representing the meaning of the sentence. It then calculates the 'distance' between this vector and the vectors of sentences or paragraphs from the case file. The result closest to the query entered is considered the most relevant.
The search results are presented in a list, ranked by relevance. For each result, the sentence or paragraph, the source, and the page number of the document are displayed. The words or phrases that, according to the algorithm, have a semantic relationship with the user's query are shaded yellow.
The search query is not stored in the Elasticsearch database. It may, however, be temporarily stored in the user interface so that the user can view previous searches.
External provider
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