The Cannabis Embassy of South Africa

Well usually the police won't be able to get a warrant so they will ask your permission to come in. They do this in many ways. They may come past and ask to speak to you about a missing child for example. By allowing them inside your property, even one foot, you give them full access to your property without the need for a warrant. When inside, they suddenly smell your stash and you are busted!
DON'T LET THEM IN WITHOUT A WARRANT.

They may come past and act all tough. "We have had some complaints that someone in the area is smoking dagga. May we come inside and have a look around?" Notice how they always ask? "May we come inside?" They have to get you permission.
If you say yes, your busted!
DON'T LET THEM IN WITHOUT A WARRANT.

But what happens if you say no?
The best way to deal with them is simple.
Police: "We have had some complaints that someone in the area is smoking dagga. May we come inside and have a look around?"
You: "I'm sorry, I don't allow anyone into my apartment that I don't know. Not even the police even if they have a warrant. Do you have an authorised warrant?"
Police: "No we don't, but we can get one. We just want to ask you a few simple questions, it will only take a minute. If we come back later, we might not be so understanding if you have something to hide."
You: "If you have something important to say, you can shout through the window or intercom, or get the control room to call me. Alternatively, write a note and leave it in my letter box. If you get a warrant, come back and kick the door down as my mother always told me never to open the door to strangers. Have a nice day Peace Officers"
DON'T LET THEM IN WITHOUT A WARRANT.

Oh and one last point.
DON'T LET THEM IN WITHOUT A WARRANT.

If they have a warrant, make them smash the door down. When they drop the charges, they will be forced to pay for damages.
DON'T LET THEM IN WITHOUT A WARRANT.
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Understanding The Difference Between An Undercover Agent And An Informant.

An undercover agent is not allowed to partake in the use of 'drugs' or Cannabis. The best way to identify the agent therefore is to offer them a hit. They will usually make one of the following excuses as examples. They just smoked some Swazi like an hour ago and are still too high. Or they are not feeling well.
If passed a joint, they will fake puff it. Make them smoke a bong as that can't be faked.

This is why the government employs informants. Informants are not the neighbours or concerned citizens. Informants are actual uses of the drugs or Cannabis who have been arrested and agreed to make a 'deal' with the government to inform them of the details of the other drug or Cannabis users in the group or the non-government authorised dealers that supply/grow. They too can be identified as whenever there is a raid they somehow manage to always not be present. Coincidence?

Message to the police.

"To cause crime to occur is to be accountable for the crime, morally and legally. To consent to any measure is to share responsibility for its results." 

Don't ever let the police inside your premises (for any reason) without a warrant. The government are not your friends.
Remember, if there was any REAL danger, the government would be able to show it to you empirically (not hypothetically or by using their own, grant-paid 'scientists' (read prostitutes)). The fact that they cannot show you the harm empirically means they are deliberately lying to remove your freedoms which is a crime against humanity that the government must be held accountable for. We can never negotiate with the government until those who implemented and enforced these tyrannical laws are brought to justice.