sign in / register

More blog items

Simple Random Sampling with Random Search Selectors


Humans are not great at making truly random selections. We are all susceptible to unconscious bias which can be a problem when selecting individuals to be searched. There is the possibility that some people will feel that they have been unfairly targeted and their selection was due to bias or prejudice. This is obviously something that organisations need to avoid as it could lead to serious legal action.

Random Sampling

Random sampling is a statistical technique that’s used to select items or people for further attention or research. Random sampling techniques are required to ensure that each person or item has the same, equal probability of being chosen as every other person or item in the group. These are the most commonly used random sampling methods:

  • Simple random sampling
  • Stratified random sampling
  • Cluster sampling
  • Multistage sampling

Simple Random Sampling

Simple random sampling is the most commonly used methodology. Simple random sampling considers all of the people or items in a ’population’ as one group. The term ’population’ simply refers to all of the people or all of the items from which samples are taken. Individual people or items are selected from the ’population’ at random. As long as the selection of each person or item is equally likely then a genuinely random sample will be selected.

random search operations

Random Sampling Examples

There are many situations in which people are challenged with the task of making truly random selections. Here are some examples:

  • Airports, transport hubs and border check points. Randomly selecting people and baggage for more thorough inspections.
  • Schools, colleges and other educational establishments. Randomly selecting people for searches.
  • Manufacturing environments. Randomly selecting employees for evaluation.
  • Retail outlets. Randomly selecting staff or randomly selecting exiting customers for searches.
  • Health and safety professionals. To make random selections for thorough evaluation.
  • Customs and excise. To randomly select packages and goods for thorough inspection.
  • Parcel delivery and courier services. Randomly selecting items for inspection.
  • Transport firms. Randomly selecting vehicles for safety or load checks.
  • Sports and music events. Randomly selecting attendees for thorough search.
  • Nightclubs. Random checking of patrons for drugs and weapons.
  • Gate security at various premises. Random selection of visitors and deliveries for checking.

There are many situations in which truly random selections need to be made, often for the purposes of search and security. It’s absolutely vital that the people challenged with the task of making these selections and carrying out searches are equipped with what they need to avoid accusations of bias and to ensure they are genuinely making random selections.

Random Search Selection

It’s essential those required to make random search selections are enabled to make truly random selections and are protected against accusations of bias. Luckily, there is a low cost solution that eliminates the risk of being accused of discrimination or favouritism by ensuring that selections are entirely random.

random search selector

The Random Search Selector is a simple electronic device that takes away any concerns over bias or favouritism. These clever little units support the process of simple random sampling by ensuring that selections are entirely randomised. Available as either mains-powered or portable battery powered units, these devices are super-simple to setup and use.

dip switches random search selector

The required selection percentage is configured by means of internal dip switches that allow settings of from 0.5% to 100%. As people pass by a defined control point they press the large red activation button on the Random Search Selector. The device automatically determines whether the individual should pass without attention or highlights them for a ‘search’. The software randomiser ensures that selection is truly random and unpredictable.

battery powered random search selector

The battery powered Random Search Selector is ideal for mobile use, powered by 3 x AA size batteries, or via an external 12V power supply. Fresh batteries will last for an incredible 50,000+ operations.

Random Search Selector Accessories

The flexibility of the mains powered Random Search Selector is extended by using an optional remote activation button and / or remote indicator.

random search selector remote activation

The remote activation button is designed to be located in a convenient position for users and connects to the master unit by cable. The remote indicator reflects the ’search’ or ’pass’ feedback presented from the master unit.

spot checker random search selector

The ’Spot Checker’ is a battery powered, portable Random Search Selector mounted on a tough clipboard. This is the ideal configuration for situations where portability is essential. For example, when used by vehicle management professionals to make selections for safety checks or in circumstances where random selections need to be made in multiple locations.

Using low-cost Random Search Selectors has been widely proven to be an effective way to relieve staff of anxiety associated with making random selections and ensure that the selections made are truly random. From selecting travellers at airports for metal detector scanning to selecting lorries and trucks for safety evaluation, Random Search Selectors are ensuring that bias doesn’t cause problems.

If you have any questions regarding randomising search selections remember that we are here to help. Give us a call on 01273 475500 and we’ll give you some free, expert advice. 

This message was added on Thursday 5th March 2020

About insight Security
  • It's easy to order from us and we're easy to contact...
    whether you need help or advice before or after you buy
  • Our proven, tried and tested products do what we say...
    which is why we can offer you a 'NO QUIBBLE GUARANTEE'
  • Fast Reliable Service... your goods will normally be delivered within 1 to 3 working days - call us if you need them urgently!
  • All our products are very competitively priced... but more importantly, we believe they offer you the Very Best Value!

...these are just a few of the reasons that most of our customers buy from us regularly and recommend us to friends and peer groups. So buy now with confidence - and join the thousands of happy customers we have helped over the last 20 years... and remember, if you're not sure what you need, or which solution is best for you, our specialist advisors will be pleased to help. Just call us on 01273 475500.