Defining The Headers On The FMCSA PSP Profile

First of all, PSP means Pre-Employment Screening Program. When you request all the information that the FMCSA has in their databases about you, you are requesting your PSP profile.

REGISTRATION_DATE (Source shows all of the Data Element Definitions in the Inspection File/report): Indicates the date the certification of correction of defects was registered. (I don't understand this.)

CI_STATUS_CODE: "Indicates the status of the inspection. (U= Unprocessed, T= To Census Search, C= Complete, N= Non-match, I= Intrastate, H= FMCSA hold, P= Potential Resolution, X=Non-motor carrier)"

Aspen is a software application used by FMCSA and most State Commercial Motor Vehicle (CMV) enforcement agencies to conduct inspections on CMVs and drivers. The software runs on laptop computers either in a mobile unit (State police cruiser), or at a fixed inspection site. Aspen is used to collect inspection details and print the associated report. Source

SNET (SAFETYNET): “A database management system that allows entry, access, analysis, andreporting of data from driver/vehicle inspections, crashes, compliance reviews, assignments, andcomplaints. It is operated at State safety agencies and Federal Divisions and interfaces withASPEN, SAFER, MCMIS, and State systems. It is an Oracle based client-server application thatruns on MS Windows servers.” (Source)

INSP_CONFIDENCE_LEVEL: "...Indicates the Inspector's level of confidence on the carrier/USDOT number match. Could be X, O or Null."
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CVISN Commercial Vehicle Information Systems and Networks

specially equipped laptop computers, known as mobile data terminals (MDTs)

Electronic safety information exchange functions have been available to inspectors in Connecticut since about 1992, when the first "pen-based" laptop computers (the forerunners to today's MDTs) were deployed in enforcement vehicles. At first, ASPEN inspection data were transferred from the field to a central office using floppy diskettes, and from there the data were uploaded to SAFETYNET. Later upgrades in technology for roadside enforcement included dial-up modems connected to an electronic bulletin board, cell phone dial-up, touchscreen laptops, and, starting around 1994, wireless transmission.
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Use of automated procedures for data collection in the field to eliminate typing errors in critical fields on accident and inspection reports, like USDOT number, plate number and VIN. An example of effective automated procedures is the bar-coding of motor carrier identifying information on cab cards and the use of pen-based, lap-top computers to read the bar-coded information and automatically enter the data on state enforcement forms.
Source
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MCMIS = Motor Carrier Management Information System