The future of testing for performance-enhancing drugs in international sports will likely be characterized by the development of new analytical techniques, improvements in existing methods, and the integration of cutting-edge technologies. As doping techniques become more sophisticated, anti-doping organizations will need to continually adapt and innovate to maintain the integrity of sports. 

Here are some potential future developments in this field:

1. Expansion of Omics Technologies: As mentioned earlier, omics technologies (e.g., genomics, proteomics, and metabolomics) are expected to play an increasingly significant role in anti-doping efforts. By analyzing large-scale biological datasets, these techniques can identify patterns and biomarkers indicative of performance-enhancing substance use. This information can then be incorporated into the Athlete Biological Passport, providing a more comprehensive picture of an athlete’s biological profile and making it more challenging for dopers to evade detection.
2. Artificial Intelligence (AI) and Machine Learning: AI and machine learning algorithms have the potential to revolutionize anti-doping testing by automating data analysis and interpretation. By processing vast amounts of data quickly and efficiently, these technologies can help identify suspicious patterns and anomalies in an athlete’s biological profile. Additionally, machine learning algorithms can be trained to recognize new doping methods and substances, enabling a faster response to emerging threats.
3. Point-of-Care Testing Devices: The development of portable, point-of-care testing devices could make anti-doping tests more accessible and efficient. These devices can analyze biological samples (e.g., blood or saliva) on-site, providing real-time results and reducing the need for laboratory-based analysis. This innovation could lead to more frequent testing and improved detection of performance-enhancing substances.
4. Detection of Gene Doping: Gene doping, which involves altering an athlete’s genetic material to enhance performance, is an emerging concern in sports. To address this issue, researchers are working on developing methods to detect the presence of foreign genetic material or changes in gene expression patterns. Techniques like CRISPR-Cas9-based gene editing detection and next-generation sequencing (NGS) could be instrumental in identifying and preventing gene doping in the future.
5. Improved Collaboration and Information Sharing: Increased collaboration and information sharing among anti-doping organizations, sports federations, and scientists will be crucial to stay ahead of doping techniques. By pooling resources and knowledge, the global sports community can develop more effective testing methods and promote a culture of clean sports.
6. Advances in Mass Spectrometry: Further improvements in mass spectrometry techniques, such as high-resolution mass spectrometry (HRMS) and tandem mass spectrometry (MS/MS), will likely enhance the detection of prohibited substances. These advancements will allow for more sensitive, accurate, and comprehensive analyses of biological samples, making it even more difficult for athletes to use performance-enhancing drugs without detection.

In conclusion, the future of testing for performance-enhancing drugs in international sports will likely involve the integration of new analytical techniques, technological advancements, and increased collaboration among stakeholders. As doping methods evolve, the global sports community will need to continue to invest in research and innovation to maintain the integrity and fairness of competitions.