Table 1.

Summary of Procedures Involved in Alcohol Drinking Sessions

Time	Procedures
Appointment earlier in day	BrAC reading, urine test, pregnancy test for women. Technology randomization, instruction and practice technology use with staff.
1pm	Participants asked to eat lunch but stop eating at this time
3:30–3:45p	Participants transported to simulated bar laboratory for the session.
4pm	Participants arrive at simulated bar lab, then BrAC. Instructions/rules for the session reviewed, self-reports and cognitive/psychomotor tasks. Instructions and practice technology use again. Participants relinquished their personal phones
5pm	Alcoholic and non-alcoholic self-administration begins, ad libitum. Participants’ eBAC tracked, not permitted to reach eBAC ≥ .10. Participants encouraged to use assigned technology but not to share results with others
8pm	Alcohol self-administration ends. Small glass of water to remove mouth alcohol, self-reports, BrAC for all participants, then cognitive/psychomotor tasks. Participants’ personal phones returned.
9pm/hourly	Self-reports, then BrAC for all participants
11pm	Self-reports and BrAC. Technology acceptability and usability ratings. Instruction in and practice use of other two technologies not assigned for the session. Technology provided and apps put on participants’ own phones
12am	Self-reports, BrAC. Released when BrAC <0.02%, ride home paid for by study

Notes. BrAC = breath alcohol concentration, eBAC = estimated blood alcohol concentration