The Supervisors have the following supervision rights while carrying out their supervisory tasks:

1. right of access, stated in Article 16.3.12;
2. right to inspect and take a copy of business data, stated in Article 16.3.13;
3. right to investigate items, including the right to take samples, measurements, carry out tests and analyses, stated in Article 16.3.14;
4. right to investigate the means of transport, stated in Article 16.3.17;
5. right to receive support, stated in Article 16.3.18;
6. right to make determinations by means of audiovisual resources, stated in Article 16.3.19;
7. right to receive police assistance, stated in Article 16.3.21.

Supervisors may always, without prior notice, freely enter any place and take with them the necessary material. They must respect the internal and external safety procedures while doing this.

However, they only have access to occupied rooms if they meet one of the following conditions:

1. they have prior and written permission from the occupant;
2. they have been authorised to do this, in advance and in writing, by the judge of the police court. In that case, the Supervisors only have access between 5 a.m. and 9 p.m.

With a view to exercising the supervision rights, as referred to in Article 16.3.10, 1° to 5° inclusive, Supervisors may demand access to all business documents and other business data carriers as they consider necessary for carrying out this supervision. To this end, they may ask for those data carriers to be submitted to them at a location they specify.

They may ask for a copy of all business documents and other business data carriers to be provided to them free of charge or make a copy themselves. If copying is not possible, they may keep these data carriers or take these with them, against a written proof issued by them, for the period required to complete their task.

The sampling, measurements or tests are carried out by the Supervisors or by laboratories or environmental experts certified for that purpose.

The analyses are carried out by the Supervisors or by laboratories certified for that purpose.

If accreditation is not held for a specific sampling, measurement, test or analysis, this sampling, measurement, test or analysis shall be carried out by the supervisors, or by the accredited laboratory, or in accordance with a reference measurement method or, where none exists, in accordance with a method accepted by the authority appointed to this task by the Flemish Government. 

The Flemish Government can stipulate more detailed rules related to the taking of samples, measurements, tests and analyses.

The Flemish Government can stipulate the rules for the certification of laboratories or environmental experts. They can also stipulate the conditions that must be met when using the certification.

Supervisors may investigate or let others investigate the means of transport and the transported goods, as well as demand the right to inspect the legally required documents.

They may give orders to the drivers or the escorts. They may order the drivers or escorts to stop their vehicle free of charge and take it to a location they specify free of charge.

Supervisors may demand the assistance of the police while carrying out their supervisory tasks.

To make it possible to exercise their supervision right with regard to inspecting and taking a copy of business data, Supervisors may, with the assistance of the police, proceed to opening and making use of or letting others make use of the items if the following conditions are met:

1. performing the supervisory task requires the exercise of the supervision right;
2. the exercise of the supervision right is not possible in any other way;
3. the person who has the use of the items in question does not give their permission for opening or using them.