OPS/SIS participants do sometimes bring their cooker or a sample of the drug they experienced an OD while using. Right after the OD is usually not be the best time to ask, as the participant is usually confused and in distress following an OD.
When it comes to drug alerts, to my understanding we only send out reports for high percentages, strange OD's, strong analogues of Fentanyl, harmful adulterants, or non-opioid drug contaminated with Fentanyl.
Hope this helps!