Pupils are also in attendance holding placards that read 'stop drug abuse' and 'enough is enough'.
Police made the drug discovery at the Cape Town International Airport last night.
The group, which includes a police officer, was taken into custody for allegedly trafficking drugs.
The woman was intercepted by customs officials after trying to smuggle cocaine.
This is the third drug bust at Cape Town International Airport this week.
An inspection of border security at Manchester Airport found the 6 dogs had failed to find any illegal drugs.
Cape Town has a heroin problem and it's getting worse. How many people trade, use and to what extent is difficult to determine.
The 32-year-old constable was taken into custody while on duty yesterday.
Police say the man was cornered by officials earlier this week, as he was about to board a flight to Zurich.
The 31-year-old officer was on duty at the time of his arrest.
The 51-year-old colonel also stands accused of taking bribes from the clients in exchange for their freedom.
This comes after a spate of significant drug busts made by police over the last two weeks.
Police found R3m worth of mandrax, R1m worth of tik & R50k worth of dagga in separate busts.
Police found cocaine worth about R300,000 in a 36-year-old woman's luggage.
The three men were arrested on Wednesday after police discovered their operation.
A Nigerian man and his 17-year-old female accomplice were arrested after police searched a bus they were on.
The suspect is one of 16 people arrested on drug charges after narcotics valued at R31,000 were found on him.
The leaders of Australia and Brazil had made personal appeals for clemency for their citizens among the group.
