A LMSW is a master leveled person who has completed their master’s degree in social work and is licensed to practice social work. A LMSW required to completed 4,000 hours of supervision over the span of two years of supervision under an approved LCSW. A supervision form is required to be submitted to the Arkansas Social Work Licensing Board to document the Supervision contract PRIOR to supervision.
According to the Arkansas Social Work Licensing board: 

Levels and Qualifications

The levels of licensure and requirements are as follows:
Licensed Social Worker (LSW) -
A bachelor's degree in social work from a program accredited by the Council on Social Work Education (CSWE); successful completion of a Board-approved examination; and has applied a criminal background check and has not been found guilty of or pleaded guilty or nolo contendere to any of the offenses listed in A.C.A. 17-103-307 - PDF.
Licensed Master Social Worker (LMSW) -
A master's degree in social work from a program accredited by the Council on Social Work Education; successful completion of a Board-approved examination; and has applied for a criminal background check and has not been found guilty of or pleaded guilty or nolo contendere to any of the offenses listed in A.C.A. 17-103-307 - PDF.
Licensed Certified Social Worker (LCSW) -
A master's degree in social work from a program accredited by the Council on Social Work Education; two-years (4000 hours) postmaster's LCSW supervised social work experience; successful completion of a Board-approved examination; and has applied for a criminal background check and has not been found guilty of or pleaded guilty or nolo contendere to any of the offenses listed in A.C.A. 17-103-307 - PDF.

Provisional License

First-time applicants for LSW or LMSW licensure will be issued a provisional license upon approval of his or her application. A provisional license will be issued one time per person and will expire exactly one-year from the date of issuance. Provisional licensing is prohibited at the LCSW level.
Applicants must apply for a criminal background check prior to being issued a provisional license. The fingerprint cards and instructions for having a background check will be mailed to the applicant upon receipt of his or her application.

Examination

The Board currently uses the Association of Social Work Boards (ASWB) examinations. Information about the examination may be found at www.aswb.org. The levels of licensure and examinations are as follows:
Licensed Social Worker - Bachelors
Licensed Master Social Worker - Masters
Licensed Certified Social Worker - Clinical

More information, including the supervision plan, can be found at https://www.arkansas.gov/swlb/index.html