"Assessing Our Risk" on Page 4 explains how the company assess risks of modern slavery and trafficking in their supply chain. They conduct research and "analyze internally-conducted and industry audit results" to identify any salient human rights risks. Beginning in 2020, Amazon began using Human Rights Impact Assessment (HRIA) for more comprehensive identification and assessment of human rights risks in their supply chain.
I unchecked the use of a tool or system as I did not find evidence of this. Human Rights Impact Assessments are not tools or systems but a methodology.
We analyze risk in our business by engaging in research,
mapping our supply chain against existing human rights
indices, analyzing internally-conducted and industry audit
results, and partnering with key stakeholders (p4)
we adopted new mechanisms to assess risk, including self-assessment questionnaires (p. 10-11)