Dear Vivien,
You can find domestic laws and ratification of international legal instruments in the official legal databases of each country. Most of the legal sources are in Arabic or French. However some are translated in English on the Tunisian website.
Morocco: http://adala.justice.gov.ma/FR/Recherche.aspx
Algeria: http://www.joradp.dz/HFR/Index.htm
Tunisia: http://www.legislation.tn/fr
I recommend you use the simple search tool with key words to have a as many answer as possible.
Also of interest:
Interpol Border Management page: http://www.interpol.int/INTERPOL-expertise/Border-management
Frontex Third Countries Cooperation page: http://frontex.europa.eu/partners/third-countries/.
The amended Frontex Regulation (EU) No 1168/2011 reinforces effective assistance to non-EU states regarding operational aspects of border management. Under the new provisions, Frontex may launch and finance technical assistance projects in third countries, also benefiting from Union funding. The Agency may also, based on risk analysis and upon approval by its Management Board, deploy its liaison officers to third countries and, on a reciprocal basis, may receive liaison officers posted by those third countries, for a limited period.
Frontex and the European Asylum Support Office (EASO) are undertaking an 18-month project entitled “Promoting the participation of Morocco and Tunisia in the work of EASO and Frontex”. Led and coordinated by EASO and funded by the European Neighbourhood Partnership Instrument (ENPI), the project falls under the responsibility of the EU Directorate-General Development and Cooperation (DG DEVCO). The project aims to promote the participation of these countries in the work of the agencies. The project will familiarise the competent authorities with the mandate, tools and instruments of the Agencies including cooperation models developed with EU MS. Frontex will promote the concept of IBM and the comprehensive approaches to the management of mixed migratory flows and in particular on the inter-agency cooperation aspects to Tunisia and Morocco, while EASO will promote the Common European Asylum System (CEAS) and sharing the EU Member States’ best practices, including on reception facilities.
You already had the link to the Tunisian Security sector legislation website operated by DCAF, but maybe you would be interested with the Libyan one as well.
Hope it helped,
Elias